Let's see.... We do the show 7 times a day, except on Not SO Scary days, and then we do six shows.
For a regular park day the show times are: 11am, 12pm, 1pm, 2pm, 4pm, 5pm, 6pm.
Our most crowded shows are the 2pm, and the 4pm- the ones directly before and after the parade.
The characters come down quite a bit in the audience esp. the Pixar characters (Woody, Jessie and Bullseye ). If you stay closer to the front of the stage, you will be closer to Chip and Dale, but honestly if you are just on the floor in the midst of the action, you can get close to the characters to play with them.
Like a previous poster said, a fair amount of people do leave kind of in the beginning, since they usually don't have kids, or their kids are too old for the dancing, so you will have plenty of room to be on the dance floor.