Absolutely, price matters. With that said, I also agree that the quality of the meal comes into play in regards to how I feel about the overall bill. For example, I realize Sci-Fi is not "signature;" however, 20 bucks for an awful burger and sides annoys me, and although the theming is amazing, I will not pay that cost for that quality of food. On the other hand, dinner at Garden Grill costs the four of us about 200 dollars, but I enjoy the experience, and the food is good, so it is expensive, but I don't mind paying. I agree with a few others that I budget before hand so I don't have to stress. Also, we select the number of table service restaurants based on what we want to pay on that trip.
Disney is expensive for food regardless of dining level, and when you're from New Orleans, it's hard to find any restaurant food in any other city except maybe Chicago, LA, or New York where the quality of food is equal to the price paid. I am lucky to live in a gastronomic center, and I don't go to Disney for the food as much as I do for the unique experiences. But, yes, price matters.