Unix is certainly an amazing OS. I know my animation professor at school has all of our quicksilvers, SGI boxes, and IBM Workstations communicating beautifully via a G4/OSX server. The Unix is fully compatible with all of the Unix-only SGI's, and we can multi render in Maya with all three systems. The only difference he noted was that Apple's 'version' of Unix is slightly different than BeOs, and some of the others, but overall its 'good' Unix, as he calls it.
But yes--it IS scary what they can do when they sit down to the terminal. I swear smoke comes off of his fingers when he types through the code. I know Unix strictly on a user level, and dont consider myself a power user--but when placed in the hands of someone who knows what they are doing, OSX is dangerous. (in a good way)