Sounds like a great trip - love AKL! It probably depends on where you choose to eat. I would look at the menus of places you are interested in to see prices of what you might eat, and which are included in the 10%, and if any are signature restaurants, which will cost 2 credits. You can estimate your OOP cost for meals, and compare what the
DDP would cost(also figuring you get your CS and 2 snacks). For many people, the dining plan is good because they can order what they want off the menu w/o thinking about the price, even if it might cost them less OOP, since they would like to not have to worry about the prices on vacation. For many not traveling w/ kids and families, they feel it is not the best value, and prefer to budget and buy discounted GC at places like Sam's and BJ's and save a little that way as well. There is a dining calculator some people on here use to try and see which is better for them (you could search on here for a link).
BTW you could start using the Disney Visa again now, and earn rewards to redeem for your trip to put towards your trip - we always wait to redeem at Guest Services when we arrive, to have as many points as possible, including paying off the trip. We have been lucky enough to get
free dining several times, so have used points for tips, extra OOP meals, souvineers, etc. I just found out about the 10% off meals, so if we go back w/o dining plan I will be looking into it. Maybe Free Dining will become available for your dates, or a room discount that can put extra money towards DDP or meal budget!