I went through the Linux-only mindset for years but now pragmatism rules and I use Linux for development and general productivity, Macs for Garageband and testing my website on Safari, and Windows for Solitaire...
...and things like Garmin and Tom Tom software
I use
Linux (Ubuntu) to do pen testing
Mac at home for iPhone development
PC (Vista (un)Ultimate) at home for development
PC (Windows XP) for day job
I occassionally use Microsoft Windows because it's the only one that supports my _______ (fill in the otherwise unsupported device that you need to use occassionally)
no bsd?
I left a "something else" category ;)
*"... I left a "something else" category ;) ..."
... and you already have Macs covered but BSD is a big category to leave out.
BSD is widely used, but as a primary workstation...? So far there's only one vote, presumably from you, in the "something else" category.