You'll have to do the math regarding the cost-benefit of AP.
Also, remember that only one person in your party needs to have the AP for your entire group to get the discount.
For US, the AP + DDE saved a good deal of money. A couple trips ago we bought one AP, 3 10-day no expiration tickets and the DDE, and between the 3 trips those were used for, we probably saved $1000+.
You need to figure out how much it would cost to just get park hoppers, and how much it would cost to get the AP plus park hoppers for the rest of your group, plus the $60 DDE card. Then figure out how much it costs you all to eat per day, and compare total costs.