I've used OS X at work for the past 2 years and I completely disagree that OS X is nice for developers. I've had a lot of issues that I wouldn't have had if I was using a GNU/Linux distro like Debian. Major issues with GCC after certain updates, outdated GNU software like bash, brew is barely acceptable as a package manager (can't hold a candle to dpkg/apt), and I have to go to websites to get the installers for most…
All the things I'd learned to work-around, suddenly became non-issues, and all of a sudden I had a real window manager again.