That last sentence is Apple's rule for everything, i.e., the user will get use to it. Apple breaks traditional rules for just about everything. It's why Apple is Apple and not DellHPSamsungSony.
But going back to OS X, it is just NeXT, one more generation up. It is pure Steve Jobs. Apple bought NeXT b/c it was out of ideas at the time and Copeland was an utter bust. But, honestly, the only problem w/ the dock was it's initial inflexibility to be pinned anywhere but the bottom of the screen. Many OS 9 users had 3rd party dock-like program launchers though.
Chupa, I almost agree with everything you say. The Dock in NeXT was on the upper-right hand side of the screen, and though you could unpin elements, the default stayed put. The Dock in OS X has got one problem that NeXT didn't: it varies. I cannot quickly move my mouse to point X, click, and expect my program to launch. I have to watch the pointer carefully. There is no "point X" - it moves.
Don't get me wrong - OS X does a better job of getting out of my way and letting me work than any other OS I've ever used, and I've used 'em all from CP/M to BeOS with a flying pass at NewWave.