I know that the end result is the important thing but I've been playing a little with manual mode. By looking at the rear screen or EVF it seems you would have to be a total idiot to get it wrong because it is all displayed in front of you, So is it not the case that Some of the " I only use Manual mode " types are just Hyping themselves up ? ( I'm ducking for cover

) Now I would be more impressed if they looked at the scene first, decided on the settings they were going to use, turn the camera on dial said settings in take an excellent photo ! ( Now digging a Bunker to hide in

) What do you think ?
OK, I'll join in.
I don't see how it's possible to select a "proper" or "optimal" exposure by looking at the EVF or rear screen.
The image you see is based on a "processed" raw image i.e. what the JPEG will look like. A correctly exposed JPEG is an underexposed raw.
You eyes adjust to ambient lighting conditions, and you can adjust the brightness of the EVF of rear screen so how can you accurately assess exposure by looking at the EVF/rear screen.
I think it's a great feature to immediately see grossly wrong exposures, but not for assessing whether you are at the "correct" exposure.
As for the subsequent discussion on "manual" mode. I think of manual as being where the photographer consciously selects shutter speed, aperture and ISO. I don't think it matters whether you get help from a built in, or hand held meter, blinkies, or a histogram. None of these things force you to use a specific setting without you actively interpreting what the tool is telling you, and you actively selecting the settings.
Many people probably use semi-manual exposure. e.g. I often use auto-iso with manually selected shutter and apertures (bird photographs). I try to predict the aperture and shutter speed I will want, but I also keep an eye on the auto ISO in the viewfinder and adjust the shutter speed or aperture to indirectly adjust the ISO.
I also rarely take a picture without a tweak on the exposure compensation dial (which also adjusts the ISO), and I have a function key set to temporarily activate nikons, rather clever, highlight recovery metering, which can be instantly hit to avoid blowing out highlights e.g. when you have a white bird fly against a dark background.
So I have an auto exposure approach which still lets me feel in full "manual" control, except for grab shots I don't have time to think about. On those occasions, I am grateful for the auto-exposure features.
On your final point, I still use handheld spot meters to read light levels (for landscapes), so I kind of also do what your last sentence says, I take several light readings across the scene, decide on the optimal shutter speed and aperture for the scene and set those on the camera while ignoring what the camera meter says, or what the live view looks like. I obviously don't use auto-iso, or exposure compensation or highlight metering in this instance.