It actually surprised me just how long the lines for Soarin' at Epcot can be when I went there, because I've easily managed to ride 3-4 times in a day at DCA with minimal waits, whereas there seemed to be a perpetual 75 minute wait at Epcot.
If you have the ability to use single rider lines, they can save you quite a bit of waiting for some of the popular lines. Soarin' and California Screamin' have these at DCA, and Indiana Jones and Splash Mountain have them at DLR (although Splash was closed for rehab on my last visit so I don't know how long that one generally takes. Even with the single rider line I still had to wait a fair bit a couple of times for California Screamin', but it was still faster than the standby line.
Oh, and if you can get there early, you can catch TSMM with a relatively short wait too. On my trip last year I got there shortly after opening and managed to get in two rides on about a 10 minute wait.