Personally I am not sure what drives some people to want OSX. Maybe the eyecandy? Not sure.
The OS just feels really limited. You can't change the shell, you can't turn off mouse acceleration without jumping through several hoops, pretty much everything was designed for one button (You've got five fingers, what is so hard about using more than one of them? I am not sure why steve jobs insists on only one) so mice with back and forward buttons are useless on top of other things like very limited scroll wheel support and relatively useless context menus (compared to MS Windows anyways.)
And since you are forced to use the default shell, you are also stuck with a few other annoyances: You can't move the dock to the top of the screen, you can't remove finder from the dock (in spite of the fact that it is accessible from numerous other places,) the delete key can't be used to delete your files, most programs depend on obscure shortcut keys rather than making effective use of function keys, apples clone of alt-tab is horrible in comparison to the MS version, and worst of all you have to actually switch to each app before you are allowed to use its menu functions rather than clicking right on them like you can in MS windows.
Those things among many other things. Sure, OSX is simple, but then anything that is very limited in terms of functions is going to be inherently simple. OSX feels more like an OS that tells you how you are going to use your computer (which follows Steve Jobs' preferences,) it doesn't let you use it how you want to use it. Which admittedly, is probably why OSX may seem so elegant at first. But once you need to use your computer for more than just novelty purposes...well, OSX quickly loses its appeal. And then you might wonder why most mac users might say "well, my work computer is a pc and not a mac."
One thing I also really like about windows better than OSX, is that in windows you can use either just the keyboard or just the mouse to perform virtually any function, so you have many alternative shortcuts to get where you want to go. OSX on the other hand, without a mouse, you are screwed for the most part, which involves a lot more of that moving your hand off of the keyboard and on to the mouse, and vice versa.
And also the idea that windows PC's crash and macs don't is completely bogus. The only PC that is going to crash is one that might have been made with faulty components or faulty drivers. The glory of the PC is that if you don't like anything about those particular components, you can replace them at any time of your choosing, and there are hundreds of brands and price levels to choose from. With macs, you either pay a premium to buy parts only from apple, or you don't buy anything at all.