I avoid the crowd calendars and I have gone on the EMH days with great success (as far as crowds) a few times. Time of day is most important to me. Get to the park at rope drop (or a PPO ADR), leave usually around 12:30 or 1:00, then go back to a park around 4:00 or later. You avoid the heat of the day, have a rest, chill out period, go back refreshed as the temperatures are getting better and the crowds start to thin. I remember the year we went when they first opened Splash. 1 hour, 45 minutes in the HOT sun. We stayed until park close, and asked DS if he would like to do anything else before we left and he said Splash. It was a walk on.