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DDP can be a savings or not depending on your style, restaurant choices, etc. However, often when people do the comparison they compare to what they would have spent on those items and that is often not reality. Often one would not have gotten the same entree, dessert, and drink options if paying OOP. The DDP may give you the chance to try other things for a controlled amount though but I would not count that as savings but rather I would count it as added value. As a rule, the type locations you mentioned (require 2 credits per meal) are not a good value on the DDP. I'd suggest you take those locations and review the info on both the regular and Deluxe plan. I think you'll find that the TIW card will be a better value than either for the type of places you've listed. Of the 2 plans, you're likely better off with the basic DDP than the Deluxe plan even if you plan to eat out 3 meals most days but look at your situation.
The ways got get the best dollar value from the DDP are to use them for the more expensive single credit TS options getting the more expensive meals and desserts and when possible, using the drink option for specialty drinks like shakes. For those plans with CS options, the difference can be even greater ranging from $20 meals at Pepper Market and Cosmic Rays to $7 meals for a hot dog or $10 for a burger meal. Same with snacks, you can use them for $2 for a soda or $4 for a smoothie.
When I get the DDP I do so making sure it is a savings to me of at least 20% over other options based on what we would have ordered OOP, anything I get above that in more expensive meals or desserts is gravy. The other issue with the DDP is that it encourages you to overeat at times though less now without the appy (basic plan). We also look at other components of the trip to decide whether to get the plan. We make reservations first to see if the locations are a good value. We make sure we are arriving early and not leaving early so we can get at least 2 meals out of the plan on the day of arrival and a min of 1 (preferably 2) on the day of departure. We try to use it for shorter stays. Often we'll use it for 2 TS options in a given day (1 lunch/1 dinner) and share a meal paying extra for a soup or salad each. We may use only 1 CS credit for the 2 of us getting a fruit or salad using a snack credit. Snack credits otherwise go to smoothies, Mickey bars, Danish and specialty snacks. IF we have left over credits we try to make sure they are CS and/or snack credits only. We then use them for a meal to go for travel home and desserts/drinks to take with us (we drive). You can generally use 1 CS meal at the resorts and get 3 snack items (drink, cookie, dessert). We don't drive ourselves crazy over these issues but do take a good look at the overall benefit of the plan for a given trip and if not clearly a benefit, we pass. The other risk to getting a DDP option is if people are ill and you lose a day or more, you have already paid for those options.