In my personal life, yes, completely. Still been meaning to look into gemRB, but haven't had enough time to devote to it.
At work, it's a different story; we use a Windows-only client management tool that I have to hop into from time to time. The print people also use some Win/OS X only software to automate output tasks (for me, it just means running rdesktop
to a Windows box, but still). For my part, I run Debian wherever I can (including my office workstation) and am trying out Parabola in a couple of places.