all the families want to be done with the park, go to dinner afterwards and then relax before bed or go shopping.
The second show is more cool because it's darker, etc. If anything I would take a nap and come back for the late show.
The one good thing about this show is if you get there early at all you should be able to get a seat. Obviously, the earlier the better. When we want front row center area we are in line an hour early.