Weekends are always busy, and since this is a holiday weekend crowds will be even busier. The next 2 weeks will be slower, except for the weekends, and then after the 3rd week it's pretty much busy until after the 1st. There is a useful
Crowd Estimate Guide in the Vacation Planning forum, with lots of other threads showing the same type of questions. I am zapping this over to the same place for you...