Not a state secret, but still holds for every theme park in this galaxy:
Get there early, especially if you need to buy tickets.
USH can be done in a day. Visitors may want to eat or shop at CityWalk, so the sooner you can finish in the park, the better.
USH has two levels. You absolutely, positively, do not want to go down to the lower level more than once. If you've seen longer escalators, call Guiness.
My experience at USH produce this suggested order:
1) Simpsons
2) tram tour
3) lower lever (Jurassic Park, Revenge of the Mummy, etc.)
4) back to upper level