I went down there last year on Labor Day, Monday, and still to this date, I have never been down on any other day that there were so many people... and they were literally all over the place. Must have been over 30 on the landing beach side, down to the first main bend in the creek. Upstream was even more packed, groups around all the smaller beaches, close to 40 in and around the pools themselves and on the main beach. I hiked all the way to Indian Campground upstream before I found some sand and shade to enjoy without a clothed group hanging out.
This year I was going to go one day this weekend, but now with the thunderstorms sticking around through at least Saturday now, I'm not sure.