Soarin', Screamin' (such an amazing roller coaster that never gets old), ToT is just incredible. Grizzly is a favorite especially on rainy days. For some reason when people are already wet from rain, they don't like getting even wetter... we love it!
Ariel's Grotto is now our 2nd favorite restaurant (behind Blue Bayou) after discovering it this trip. Taste Pilots is amazing as well. There really is so much to love at DCA and I think the problem that most people have with it is they try to say that it's not like Disneyland... but it was never meant to be like Disneyland. It's a different kind of park. I agree that the themeing feels a little weak and that space usage wasn't thought out quite as well as it should have been, but I really love DCA and we spend at least a full day there when we go.