If you want any chance at all of going on either Crush's coaster or Tower of Terror in the studios then i suggest you get there for about 9.30 before it opens, the go and get a fast pass from the machines next to the rides, it will tell you what time to go back and it will save you queuing. We came back last night and the queues for these rides without fast passes were over a hour long.
We found this was the same for the Peter Pan ride in the park.
Also make use of the drinking fountains thats around the park, there are some next to the band stand at the entrance when you go in. We had empty water bottles and just filled them up through the day and it saved us a fortune.
If you want any chance of getting photos taken with the characters or autographs then dont be polite when it comes to queuing, i started waiting patiently but found that you just get pushed out the way by other's so you have to be pushy and just out your kids next to the characters as they are finishing with others or you'll have no chance!!