Agreed! Gen con was totally awesome. Enjoyed GMing more than I thought I would. Possibly because during my time slots, the rest of our 'group' were gming also--mostly LFR, but some other things too. I got to meet new people, who liked the game, always a good thing.
Granted, tormenting John is always enjoyable. I am totally GMing when he's room captain, just so I can have him at my beck and call.