Our vacation was May 31-June 6th. The crowds were low in the mornings, moderate to heavy in the afternoons, and moderate in the evenings. I used touringplans.com to pick which days the crowds were lowest for that time of year. I also selected plans that best suited our family and followed them as far as where to be in a park at given times. If there was no or little wait, we rode our favorite rides several times. It held true at each park. Peter Pan was a walk on when we rode it and an hour later it was up to 40min. We saw this happen multiple times with rides. They also give good suggestions for what and when to get fast passes so you don't waste them. I would use the plans again.