It's not as much effort as it sounds. My home laptop has had Ubuntu, Mint, Mageia, Suse, Fedora, Arch, Windows 7, 8, OS X 10.7, 10.8, and just today, 10.9 on it in about a month (it's a mac).
I have an external hard drive with all my documents, projects, music, movies, etc. on it. What's absolutely essential is recopied to my hard drive each time. It's kind of addictive to dive into a new operating system and learn it every so often. That's why there's a term for it - distro hopping.
It's good for some things. It gets you very good at doing rote computer tasks because you do them over and over in slightly different environments each time - install homebrew, update ruby, install rvm, configure common programs, tweak preferences and small aspects of the OS, etc.
As a result, I can wipe my entire hard drive and bring it back up to my workflow speed in less than 3 hours on a linux distro I roll myself via Arch.
All that said, I like OS X, so I'll be sticking with Mavericks for a while now.
I'd be interested to see your thoughts on each distro, even if it's just a sentence or two. Switching quickly, while obviously making some types of perspective difficult to develop in such a short timeframe, probably makes it easier for you to notice some things most people wouldn't through more typical usage habits.
