I think you got some great suggestions, so I don't really have anything to add there. My youngest was 4 and 5 on our last two trips, and we had the dining plan. So we did sit down meals almost every day (we did 1 or 2 2-credit meals on each trip). And, like Teresa said, my kids needed the chance to slow down. If it seemed like it was going to be a "difficult" day, we went back to the resort a few hours before dinner for a swim and/or a nap.
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My Countdown Counting down to: Universal and Walt Disney World - it's been too long! 96 days, 3 hours, 29 minutes
My Previous Trips 1977 to 1990 - Multiple WDW trips; 1980 - Disneyland; 6/95 - All Star Music; 3/00 - Fort Wilderness; 4/02 - Fort Wilderness; 5/04 - offsite; 12/05 - offsite; 9/07 - Port Orleans French Quarter; 8/08 - Beach Club; 11/09 - Disney Wonder