With kids that age, I would say no; its not worth it. Our first trip our kids were 7, 4, and 1. We found that the biggest benefit was to get to the park early, go back to the room for naps, and then return to the park that evening. It worked great as kids weren't cranky and were kept rested which in turn helped my DW and I to actually feel like we were having a vacation.
That's really no different than going to a park in the morning, going back to the resort for a nap, and then going to a different park in the evening. But, by hopping, you have much, much more flexibility in avoiding crowds.