OSX is just as usable as Win7 when you give it more than 5 minutes of your time, could you also explain the 'folders first' please Soldant? Since I have never had an issue with this as the folders have always been first on the list for me, and am actually quite fond of the new filmstrip method they implemented with Lion. The only niggle I had was having to break the terminal out to view hidden folders, which took 30 seconds of my precious time.
Also, performance of Source engine games is really quite comparable (as in 5% maximum difference) between both operating systems in my experience, Deathspank actually runs better under OSX than 7 (probably because the engine is written in Obj-C.) There aren't many other examples of games I could cite since I haven't tried games above my spec too much, Dungeon Defenders ran quite well under OSX? Since Epic have native support for it now with UE3.