Absolutely not a problem. The show starts about 20 minutes before the scheduled opening time, and it's one of our favorite things to see...definitely gives the day a nice happy start. When the show is over, you are then free to follow the mob at whatever pace you choose, whether letting them go well ahead of you...or joining in. We did this a few weeks ago, with plans to turn left into Adventureland. We made no effort to get to the front of any pack, but as expected, the vast majority of the crowd continued on to Fantasyland so they could be first in line for the two biggies (Gringotts and Hogwarts Express, right...Buehler?), so we pretty much had Adventureland to ourselves for a while.