We ended up splitting quite a few CS meals last time we were there, too, just because the meals were so large and we hated to waste food. One night we weren't extremely hungry we all (3 adults and 2 kids) shared just 2 CS meals from the resort food court and STILL ended up with food left over!
On average-hungriness meals, I'd still say that a meal without dessert tended to be more than enough for any of us, adults or kids. 2 meals per 3 people, plus an extra drink for the 3rd person, worked out just about right.