I was at Typhoon lagoon on Sunday (5/25) and the crowds were quite good. Even around 1:00 in the afternoon the wait for Crush n gusher was about 10 - 15 minutes. Storm slides and Humunga Kowabunga were 5 minutes, and Shark reef about 10 - 15 minutes.
The weekend before (5/18) I was at Blizzard beach and similar crowd levels, most lines were 15 minutes or less.
And weekends are usually busier than weekdays.