Why would anyone want to do that?
For me it has been the fact that it just works no slowing down no looking for Windows drivers, just got a new printer and it just worked I upgraded os and it just works. If you have an ipad them I am telling you nothing you don't already know. Plus all your computing will be integrated. Also for me the screen is very easy to look at.
What's all this slowing down business? I've never understood that. My PC is as fast now as when I built it... which is significantly faster than your Mac incidentally

Drivers are not a problem, and haven't REALLY been since Windows XP, but especially since Vista. I've bought 2 printers recently, and they just worked. The only reason I installed drivers was because I chose to, to ensure I had the very latest version from the manufacturer - it wasn't necessary however. Even if it was, what's the big deal about installing a driver? Takes a minute or so.
While we're talking about iPads... what's so great about them? I have an iPad, and it's useless. What's the point of a portable tablet that you can't even get files onto it easily with? Why can't I just plug a USB stick into it if I need to put a file on it... you know.. like people at work, and my students always do? Pointless thing. Why must EVERYTHING come through the App store? Why am I forced to have an iTunes account when I don't want or need one? (last time I had iTunes some Chinese hackers relieved me of £600 so never again). Why can I not access a real OS where I can create folders, plug a device in, and drag and drop files? It's a toy... nothing more. MS Surface kicks it's ass into next week, because it can do all these things, and you can use it as a genuine portable computer. No crippled OS, no compromises.
Why do Apple insist on this propitiatory system that lets me do nothing? Why can I not upgrade memory in a 21.5" iMac... the most popular model incidentally. Why are all their iMac GPUs around 4 years old compared to PCs? Why is the Mac Pro only available with that crappy D500 Fire Pro card? Why can I not fit a W9100 in it? Oh yeah...I remember now... it doesn't physically FIT does it... because Apple as usual place form over function and designed the Mac Pro to look like a small trash can.

A supposedly HIGH END workstation where performance plays second fiddle to design. Brilliant... just what a graphics professional needs. You see this with iMacs too. Sure.. lovely and slim.... because they had to take the optical drive out, so now you need one on your desk via USB or Thunderbolt, thus making a mockery of the whole point of a All-in-One design. The RAM on the 21.5" model is soldered in as a result of this design philosophy too... just not enough room for standard DIMMs. What's with that size range any way? Either a 21.5" which is too small, and then a massive leap to 27". Why no 24" 16:10 option, or at least a 23" model?
Basically, buy a Mac and you're locked into a design philosophy and awkward upgrade path. DDR4 is here now, as are the 8 core Haswell-E chips... Macs won't get either of those for another year at best... more likely 2 years is past iMac models are anything to go by. In fact... iMacs won't get them at all. Just as Sandybridge-E based architecture never made it to the Mac, Haswell E won't either, unless it's in the Mac pro, and again it will use the Xeon equivalent because Xeons are SOOOO professional aren't they? LOL.
You can always upgrade the entire ****ing machine though I suppose.. LOL I can just fit a new motherboard, CPU and RAM for a fraction of the price.
I use iMacs every day at work, and find them far more frustrating than windows. It multi tasks horribly, and is painfully slow at some surprisingly simple things. The lack of deep level access to the OS is very frustrating when it doesn't do what you want, as there's nothing you can do about it.
What do you mean all my computing will be integrated? No idea what you're on about there, sorry. Do you mean everything is in one box? Why would I want that?
Mac screens are crap. Whoever thought a shiny screen was a great idea wants shooting. Technically they're just not that great either... just a crappy narrow gamut sRGB monitor with white LED back lighting. Why is it so great? I'd rather not be dictated to thanks.... Eizo got my cash for a monitor, as they know what they're doing, and know what a graphics professional needs, and built accordingly. The result is big, fat and ugly, because they don't give a rat's ass about what it looks like... just what it DOES. 4K is here now.. I can just buy a new monitor, as my GPUs are more than capable... you can't , even if yours were... which they're not. A new entire machine for you I'm afraid.
And here's the crunch. Just built a Mac Pro on the Apple store website, and the closest I can get to this PC I'm on now would cost me £4543.00 excluding monitor. It's not as fast, has nowhere near the same amount of storage, a much smaller SSD.. and a much slower SSD. The DDR3 only runs at 1600MHz as opposed to my 2233MHz... has crap GPUs, and can only have 2 of them whereas I could have 4 if needed. The 6 core Xeon only runs at 3.5GHz.. and why a Xeon in a workstation? I thought a workstation was meant to be a performance oriented machine? Why do I need ECC memory? It's not a bloody server... I want SPEED if I pay this much money! I could go on... and the real kicker here is that the total cost of mine? £2100.. give or take 50 quid.
You must have had a really crap PC if you think Macs are an improvement. This is the problem with PCs.. you can't just say "PCs are not as good as Macs" because unlike Macs, no two PCs are the same. A bad PC is VERY bad, but a great PC is a delight to use. You clearly had a sh1t PC.
So thanks for the "Just get a Mac" advice, but upon careful consideration of your sage advice, I'll have to say.... I'd rather shove wasps up my arse. Thank you.