Ummmm I love DCA...lol.
However if I have to pick something in Disneyland, it would be the hour between 11:00pm and Midnight, or as my family calls it, 'THE HOUR OF POWER'.
We sprint from land to land hitting all of our favorite rides, unfettered by the crowds and strollers. It's like having the entire park to ourselves until they kick us out. Sitting in an empty NOS watching the lights dance on the water is pretty magical.