During Eastertime, most crowded time of day in any park is 10:30 to 3 (the "prime hours"). At Epcot, many things became fairly easy to get on after 3 (but not Test Track, Mission Space). At MGM, after 4 is fairly good for many things, except Mermaid, RnR and Tower -- when there are two Fantasmics, those last two can actually get down to a 30 minute wait or less during the first Fantasmic. At MK, there is a somewhat lighter period between 4 and 8 and things other than the mountains, Pooh, Peter Pan, Dumbo can be fairly easy to get on. After 8 huge crowds return to MK and it actually gets just as crowded as being there at noon; however, lines for even the mountains decrease during the nightly parades. At AK, lines usually decrease somewhat last two hours park is open.
The lines: (a) MK: the mountains, Pooh, Dumbo and Peter Pan will run 90 minutes to 2 1/2 hours from about 10:30 on; even the Treehouse gets to over an hour during the prime hours; fastpasses will run out before 11 for popular attractions; (b) Epcot: Test Track will go to about 3 hours by 11 and stay there for rest of day, Mission space will also have 2 hour line; Fastpasses for the two will run out by noon; other attractions, other than first thing in the morning, will be very crowded until later in the day; Spaceship Earth can get 60 minute line early in the morning (it is the first thing everyone sees when they arrive and, like a magnet, everyone just goes there) but after 3, it is a walk-on; (c) MGM: Tower, Mermaid, and RnR reach two hours or more and stay there all day, fastpasses can run out by 1; other attractions during prime hours get to 60 minutes or more; (d) AK: first hour in the morning is somewhat OK, then lines for Safari and Dinosaur can get to 2 to 2 1/2 hours, others 60 minutes or more during prime hours; fastpasses can run out by noon.
