I switched to Windows on the laptop last year to play EVE Online, but even though I'm no longer playing EVE Online the laptop still stays in Windows. This is an old laptop, XP still feels zippy on it, and studying means I don't spend nearly as much time coding or doing heavy lifting at home as I used to. So I've had no impetus to switch back to Ubuntu.
At work, after a year of living predominantly on a Windows desktop (a dozen Putty and cygwin sessions notwithstanding), I'm again using Linux as a dev environment. How I've missed Ctrl-Alt-Left and Right!