I switched from a Linux desktop to a PowerMac G5 early this year. The experience has been a bit like when I sold my Porsche and bought a Corvette. I loved the Porsche but there were a lot of quirky little things that I had to ignore and there was always something that needed tuning or fixing. The Mac, like the Vette, not only has more power, it's much more usable as a daily driver
Now, I still have Linux on my Thinkpad, my web server, my MythTV system, a half dozen virtual machines, and of course, the Zaurus but those are special purpose environments where I can get a narrow arc of capabilities working the way I want and then leave it alone.