My biggest gripe about the mac is how difficult it is to switch between applications. The Windows and Linux taskbars display every thing you are running, and you can switch easily (or alt tab if you are like me).
On a mac, its no wonder the sell those gigantic displays. My neighbor who has a 25+ incher using an Apple G4 has one because he doesnt like to have a window on top of another! Going full screen means that when you need to switch applications, you have to minimize, shrink, move, or completely close the application on top of it. This is the only reason why apple is the worst multitasking machine ever.