I disagree: OS X window management is geared towards people on a single laptop screen, no matter their level of proficiency. I am absolutely happy with OS X 10.

I disagree: OS X window management is geared towards people on a single laptop screen, no matter their level of proficiency. I am absolutely happy with OS X 10.8 on my MBA 13", and I use the new-style fullscreen quite a bit. Once I arrive in the office and sit down with two external displays, everything suddenly works against me. I don't want to use spaces (it confuses me to have 2 displays x N spaces), but Mission Control insists on the spaces bar. Putting Xcode into full screen will effectively disable the other display. I'd go insane without Divvy.