My observations from the last 2 ESPN Weekends:
Not only is MGM not crazy, the rides and attractions were walk-ons for quite some time after rope drop. The ESPN events drew the crowds, and those not interested in ESPN stuff were probably scared away by the prospect of crowds. Speaking of rope drop, the first day of ESPN in 2006, a Fri., the crowd at the rope was less than 10 deep. It was the lowest turn out at a RD I've ever seen, in any park, ever.
All my experiences with this event took place on the first day, Friday, and the next two days might not have been the same. I haven't decided which parks we're going to hit on which days this time down, but ESPN Weekend will not affect my decision in any way. As for the other parks, this is Peak Season, but I'd call the crowd level 'Moderate'. Get to the parks early, use FastPass and you'll do fine.
Bill From PA