I've also generally found that even the "my first program EVAR" projects are very frequently functional, stable, and integrate with 90% of the apps most people use (built-in ones, and ones compatible with those).

Try saying that about Windows applications.

I've also had far far far fewer headaches, crashes, and general "wtf" moments with my app-testing habits on OSX than I have on Windows, and I'm clocking 2,000-3,000 (or higher) on OSX and well over 5,000 on Windows. Seriously.