MK - Splash Mountain in the middle of august for 2 hours, definitly..the fans kinda help and the splash at the end was worth it. But splash mountain means more than just a typical ride, I used to operate a log flume ride at Seabreeze in Rochester NY and until splash opened, they had the steepest drop.
Epcot - Test track was about 3 hours, but it was the day after the offical opening, and will only do that ride with a fast pass or single riders now (unless its off season or i'm with someone that has never been before)
Studios - Tot 1 hour this past may, and defnitly will do the wait. I always get a fast pass for RnRC because the theming in that que is awful for disney standards. The wait in the gardens isn't too bad even in august, the misters that create the fog help.
AK - Dinosaur was 1 hour, and never again. Infact, I don't plan on going back to AK until EE is open and I don't think Dinosaur (or Countdown to Extention when i first rode it) will have that long of a line.