Hubby and I generally share.
Plate of pasta with marinara and a side garden salad at Plaza Inn (DL).
Platter from Rancho del Zocalo (DL) or Cucina Cucamonga (DCA).
Caprese Sandwich and a side garden salad at Wine Country Trattoria (DCA).
We really really really disliked, to the point of hated, our slice of pizza from Pizza Oom Mow Mow. But their dish of pasta with some sort of cheesy red sauce was passable. But I doubt we'll ever go there again.
On my solo trips, I get kid's meals at Plaza Inn and Rancho. Can get the same pasta at Plaza, or a bean/cheese burrito at Rancho (and Cocina), with a small drink (small bottle of water or tiny soda is what I will get). I bring the "fun straw" home for DS.
Hubby and I even share one breadbowl of vegetarian gumbo at Royal Street Veranda (DL), and are quite happy with that amount of food! And it's sooooo good.
We figure...if we share, or get a kid's meal, and we're still hungry we can always buy something else. But if we each get a meal and it's too much, the chances of us actually eating it later are very very low.
We bring in water or get water from counter service places, too. And we bring in granola bars (or more recently, Clif MoJo bars b/c they have protein) for those times when you just want a little something, but don't want to get some expensive and big thing that we might not like (we also have some big food issues in the family, which puts most DLR snacks out of the running...we're vegetarian, hubby has diabetes and controls it completely with diet and exercise, and DS can't have corn syrup in ANY form).
The one thing we splurge on is the fruit. The fruit is so good there! Expensive, but worth it.