I live relatively locally, and often park at Toy Story when I'm doing a day trip....the busses back and forth to Toy Story run non-stop...there's probably 20 or 30 of them, so the only time there is even a little wait is after park closing when there are far more people loading onto them...but again, since there are so many running in a constant stream, I don't think I've ever waited more than 10 minutes, even at the end of the day/after park closing. Any other time of the day, it's pretty much a walk on to a waiting bus in either direction.