That's one of the things that surprised me (in a positive way) about Mac OS X when I first got to use it -- it actually does indeed do lots of things in an _understandable_ and genuinely simple way. It's also clear how much work went into making the system behave in this way, it certainly wasn't an accident.

In the era of web apps and Electronification of anything I believe most of this is sadly gone, but in the older Mac OS X models you could clearly understand and see the logic behind the software and I believe it worked well for non-technical people from what I observed.