I constantly find myself frustrated by Windows because I am just used to how Mac operates. I have been using it as my primary compute device since Lion.
However one of the things that I find interesting from the Window management point that I don't see mentioned, touchpad gestures. I cannot use Mac without gestures, even when I am using my laptop as a desktop I use the Magic Trackpad. The few times I have tried to use a mouse... it just feels wrong. I would highly recommend taking a look at this and looking at the window management from this prospective. Because of these gestures I never think I need to snap things because switching windows is a quick swipe and and a click. Then all the other gestures, hot corners, etc.
That being said, I find the same issue with my partner. He has never used a Mac (has an iPhone though) but sometimes he needs to do something quick so grabs my laptop. It is fascinating watching him struggle with the trackpad and other basics that to me I don't even think about anymore.