I can not speak to crowd level, but to anwer you question of is it worth to go. I say "heck yah"
Assuming you are already planning on purchasing a multi day hopper, one more day is only going to be around $10 more per person. So even if all you do is walk down main street, watch the fireworks and get the lay of the land(s), that is so worth $10.
Get all the Oh and Ahwing out the way so in the morning you can go go go.