I would think that Memorial weekend would be busier since it is a holiday. I think many schools are not out yet the 1st wk of June which keeps crowds lower.We were at US last year during the first week of June and crowds were low. Even FJ was less than 30 minutes every time we went by. Hulk and Transformers were always less than 15 min standby waits. The longest line we encountered was the Minions ride. Granted, this was 2 wks prior to DA opening up but we are going back May 30-Jun 6 this year and hoping for low to moderate crowds.