We switched from the regular dining plan to the QS meal plan when they stopped offering the regular plan to values for "free". I thought it would be awful to eat CS all of the time but then I sat down and checked out the menus (here and on allears.net) and found some great CS places!
Now we're to the point where I really like paying OOP vs the QS plan - it allows us to spread out desserts (we can just eat a meal then have a snack/ dessert later instead of with the meal).
I suggest you check the menus and think about what food you all would eat and what you could easily share.
We're a family of 3 (dd is 12) and we always split 2 CS meals at a time (ie lunch/ dinner - usually have breakfast in the room). It's plenty of food for the 3 of us. If we're on the "free" dining plan (I say "free because of course if you get it you give up any room only type discount) we will get the dessert with the meal but if we're paying OOP we'll get something yummy later in the afternoon or even late morning which is fun and I feel like spreads the food out a bit more.
Our budget for food for the 3 of us is $50 / day when paying OOP and we eat really well on it. Of course as I mentioned we eat breakfast in the room and we do drink either fountain / free water or sodas that we bring into the park (so we don't have to pay for drinks).
When we "gave up" the regular dining plan I thought we'd miss the TS - especially the character meals but actually we didn't. And I just love the freedom of having no ADRs to make/ get to.