We camped at 50/50 and had it too ourselves while Helen Lake was about the same as this over a 4th of July weekend.
It was actually kindof an interesting experience, if you didn't let it get to you. And luckily I had earplugs for sleep. Though I haven't gone back for seconds! The parking lot at Bunny Flat was an even wilder scene.
california is beautiful.......... but hectic