I wouldn't have initially trusted git if it weren't for Linus's Google Talk. And I'm glad I gave it the time it requires to change workflows.
The most unexpected side-effect of using git is a newfound willingness to follow experimental ideas in my projects as fast as I can think/type. I'll guess it comes from confidence in git's ability to safely partition branches in-situ; the relative speed and ease with which branches are created, merged and destroyed; and the existence of the index and stash. Git removes the version control inertia I didn't even know was there.