Do you mean all the parks overall or just the Studios. I did not go to the Studios as it was going on but the other parks were busy but not terrible by any means. 30-45 min waits on many attractions others were busier.
In 2011, the Saturday in the studios got pretty busy pretty quickly---it was an AM EMH day, *and* the ESPN 5K was there as well. Friday generally isn't as bad, and neither is Sunday, modulo the "Fantasmic Effect".