mmmm...quite a few times, and stil do, hehe. Only I don't hit the F-keys - I casually move the curser to the corner of my choice... ahhhh... mac.... and it don't just look great - it's even super practical
I always use Exposé. Whenever I'm on a PC and want to see all the windows I have open and can't. It makes me see how better thoughtout OS X over Windows. I mean yea I could use Atl-Tab to tab through the windows and what not, but it to me Exposé is faster.