Nope, you're not on your own!
I also keep my cameras on P most of the time - for general shooting it does a perfectly good job of selecting a suitable shutter speed for the focal length I've chosen while still allowing me full control over things should I want extra or less DoF or a faster or slower shutter speed for a certain effect. Any exposure compensation is easily dialled in too. On occasion, say while shooting motorsport, I'll know that I'll be after a constant(ish) shutter speed, so S gets selected and the relevant speed set, similarly, I may want very little DoF (or a lot), so A mode and set it. The main time I use full manual mode is when shooting a series of shots for a panorama; I'll take a few meter readings across the scene and pick a combination of speed and aperture that works all the way across (or at least does a reasonable job) then set the chosen settings for all the shots. The only problems happen when I forget to reset to P!
In essence, P mode is no different to A or S (Av and Tv in Canonish IIRC) - you're still relying on the meter, it's just that the camera defaults back to an optimum (in its opinion) setting when switched off and back on when in P.
I think a couple of my bodies have some "scene" modes or other presets - sports, macro, landscape etc but I don't think I've ever used them.