Lines will always be long during peak times of the day, especially between 11am - 4pm. In the past, Hulk would have a 20 minute wait for the express line around noon. The line goes down the stairs, same thing with The Mummy. If you walk up and the line is at the bottom of the stairs, that's about 20 minutes. If you haven't made it to the stairs yet, turn around and go somewhere else. That's why I tell everyone to leave between 11am - 4pm and go rest at your hotel. It's usually burning hot out, walk ways packed, long lines for everything.
The answer is to install more thrill rides to handle the crowds. Everyone goes to the newest, most thrilling ride. Sure, parents take children to the kiddie stuff, but I'm talking in general.
I don't hear people talking about Earth Quake that much. I haven't read, "Wow, we went to USF, rode Earth Quake and it was soooo coool." Yet I hear people talking about Hulk, and The Mummy all the time.
Lets hope that new HP lands comes thru.