I took my DD's who were 6 and 4 two years ago and it wasn't a problem for them to sit. It was late, we just ate, they were tired, so sitting snuggled into Mom and Dad wasn't a problem.
We went this past Dec, when they were 7 and 5 and took the nieces and nephew, 6, 4, and 2 and it didn't work. It was way too long for them to sit. My DD's have been to Disney often so weren't worked up but it seemed really long and boring for them.
Just our experience.