Apple products actually don't run any hotter than other solutions, you just feel is because the alumninum chassis conducts heat from the CPU (and GPU if you have discrete video,) but that is half of the reason Apple started using the aluminum chassis, you don't want to keep the heat in, you want to get it out and the aluminum chassis does that.
My MBP 13" does get warm, but certainly no hotter than my Dell Studio 1735, in fact I would say the actual air that comes out is cooler, but the chassis get hotter, but that was also what Apple was trying to do, so it really is a non-issue.
I personally like OS X as an OS. It's very solid and very fluid. I like it a lot better than the monstrosity that is Windows 8 and Metro.
Personally, I've been liking *nix with X and
i3 window manager until I want to play a video game, in that case I use Windows 7, but honestly, OS X is a good intermediary.