We don't even get the dining plan when we stay in a hotel - we just don't see the value in it. I have priced it out very carefully every year, and have yet to see how it would save us money.
That said, when we camp we eat breakfast in the camper every day. If it is a park day, we eat lunch at a CS wherever we are, otherwise we eat at our camper. Dinners are split between between grilling at our campsite and a TS.