[SwellJoe]

I'm certain I'm more productive when I'm running Linux, after having spent enough time in Mac OS X and Windows to have confidence in that result (my 3G modem doesn't work in Linux, and until I got a router for it, I had to boot into Windows or Mac OS X to work online, so I spent a couple of months on the other side). But, workspaces are definitely not the only factor. The biggest is actually having a really good shell (bash with the bash_completion package) that is comfortably integrated into the OS and has tabs. I'm horribly unproductive in the Windows shell, and the Mac OS X shell is just weird, though better than Windows. I'm not even sure why the Mac OS X terminal is so uncomfortable to me...it's bash, but it feels really clunky compared to the Gnome Terminal.

Anyway, workspaces are definitely something I really, really, miss when I use Windows. I regularly have a couple dozen windows open, often several of the same app but in use for different tasks, and it's kind of a nightmare to keep up with what's where.