We have found that a good time to go is right after the last Fantasmic show. Yes, the entire crowd does head over there. But just let them go ahead of you by lingering over a snack somewhere, or ducking into a shop if there's one open nearby. After the crush has subsided, just wander through at your leisure. We did this with great success last year. The CM's made no effort to hurry people through, even though by then it was past park closinng. When you get to the end, the CM's will just direct you to the park exit.