Comment I went the other way, OS X - Linux (Score 5, Interesting) 815
I went the other way about two and a half years ago. I'm sure someone will tell me I was doing it wrong; I wouldn't be surprised if they're right. But I found the FOSS package managers for OS X incredibly painful to work with. I remember it taking at least a day of mucking around with compiling and pre-built binaries just to get the tools I needed for web development. It took me ten minutes to get the same thing working in Ubuntu.
Still, there were plenty of headaches: sleep mode, hybrid graphics and synaptics. Even though I had been avoiding dependence on proprietary software since activation chased me away from Windows, I had to give up really useful Mac tools like Scrivener, Tinderbox and Screen Flow (I still boot the Mac when I need to do a screencast). I used to be a programmer. Now I'm a social scientist. These days I do mostly reading and writing, not programming; the loss of Scrivener was a hard blow. I smoothed the way by writing my own tool.
OS X was significantly better for all but the most ordinary end-user applications. My area of research is the online commons - copyright, FOSS, creative commons - stuff like that. I could make my peace with Apple when they were only a pipsqueak tyrant. When they released the iPad and it was locked down, I simply couldn't stomach it anymore: and I was tying myself to an ecosystem that could be progressively enclosed by Apple. A friend of mine - a social scientist, not a programmer - switched to Mint, proving it was finally doable. Also, XMonad is pretty cool, and my search for a decent editor finally led me to take vim seriously.
Linux isn't perfect, but it's come a long way since I first used it for development in 1993. It really is usable - and sometimes excellent - for everyday work. Using a platform is supporting that platform. I wouldn't tell anyone else what to do, but I'm content to use this one.