Last year I went to a champagne brunch at Saddle Ranch on the Sunday after the 4th, which is across from the Universal entrance. There were switchback lines both to buy tickets and to get into the park. We watched people stand in the blazing sun, for 40 minutes or more just to get into the park. I was in the shade with a bottomless mimosa and I was still miserable. Now, personally, I wouldn't want to do that, but if it were a vacation for me I guess I would feel differently. There's a lot of construction going on at USH right now for HP World, I don't know whether that will help or hurt crowds, but definitely check to make sure the parts of the park you want to see will be accessible when you're there.