We just got back and found that with the heat, we actually shared meals more than we expected. The first 2 days we order 2 adult meals and 1 kids' meal for the 2 kids (18 mo and 4 yo) to share, but that was way too much food (and we are not light eaters) and after that we got in the habit or ordering 1 adult and 1 kids meal at QS and could always go back for some fruit or more food if hungry afterwards. We rarely went back, but did find we had a bit more space for an afternoon mickey bar!
So, I guess my lesson was order on the smaller side and know you can get more if you need it. My eyes are usually bigger than my stomach and this time I didn't feel gross and saved some money!