Lo and behold, Gimp.app is up to version 2.0.0-5. That makes sense... I just put -4 on my laptop this morning. Now that I'm actually using Gimp on a regular basis, I found out in the README file how to make X11 change the focus of windows by following the mouse (making it much easier to use Gimp). There have been some PSD files that Gimp didn't fully understand, but otherwise I'm very pleased with how it works.