Looks like those font installation warnings in the AAM were no big deal. Everything works fine. Possibly a permission error or the fact I already had those fonts on my machine. Jim, I just loaded up a CS6 project in CC with a ton of prores files and it loaded up no problem. On a PC, no less. All my plugins came over with no issues.
AE CC feels a lot zippier than CS6 on first impression. Projects load up quantifiably faster. Timeline scrubbing feels faster as well. Of course it could be the clean install, or just that, a feeling. But I'm impressed so far.