Since nearly everything on here is fixed price, it makes it a bit easier to tell if the DxDDP would be better or OOP + DDP (or just flat out OOP!)
Using the following over 8 nights.
DDP: Adult: 58.66/nt/person Child: 18.88/nt/person
8 x ((2 x 58.66) + (2 x 18.88))
8 x (117.32 + 37.76)
8 x 155.08
1240.64 - Total DDP cost for 8 nights
DxDDP: Adult: 104.94/nt/person Child: 29.51/nt/person
8 x ((2 x 104.94) + (2 x 29.51))
8 x (209.88 + 59.02)
8 x 268.90
2151.20 - Total DxDDP for 8 nights
Breakfast
Crystal Palace - Ad: 26.62 / Ch: 14.90 = 83.04 (1)
Akershus - Ad: 44.72 / Ch: 26.62 = 142.68 (1)
Hollywood and Vine - Ad: 31.94 / Ch: 17.03 = 97.94 (1)
'Ohana - Ad: 26.62 / Ch: 14.90 = 83.04 (1)
Lunch
Biergarten - Ad: 26.62 / Ch: 14.90 = 83.04 (1)
Dinner
BOG - Ad: 28 / Ch: 9 = 74 (1)
Rose & Crown - Ad: 23 / Ch: 9 = 64 (1)
Aloha Show (Cat 3 for DDP comparison) - Ad: 58.99 / Ch: 29.99 = 177.96 (2) (58.98 / TS)
Hoop Dee Doo (Cat 3 for DDP comparison) - Ad: 58.99 / Ch: 29.99 = 177.96 (2) (58.98 / TS) - 29.50a per credit - 15c per credit
California Grill (just me and my husband) - 55 = 110 (2a) (27.50/ TS)
Cinderella's Royal Table - Ad: 73.04 / Ch: 43.25 = 232.58 (2) (116.29 / TS) - 36.52a per credit - 21.63c per credit
Looking at DxDDP first...
So, totaling up just your fixed price locations, we have:
$1078.24 (11)
Adding in rough estimates for BOG, R&C, and CG brings us to:
$1326.24 (15 a / 13 c)
Adding in 8 CS meals (which is probably ambitious with the other large meals here)
Ad: ~15/meal Ch: ~7/meal = 240 + 112 = 352
$1678.24 (15a TS / 13c TS // 8a CS / 8c CS or 23a / 21c)
We're still way behind on DxDDP, and I don't think snacks are going to make up the extra ~$475.
DDP "Best Use"
We're going to want to put the 8 most value gaining credits on the plan. To aid in this, I've added the per credit values for the 2 TS locations. This allows us to compare apples to apples.
From the list, the 8 most expensive per credit costs are:
1) Akershus (1TS) (1)
2) CRT (2TS) (3)
3) H&V (1TS) (4)
4) SoA (2TS) (6)
5) HDDR (2TS) (8)
Note that for kids, it's the same order up to this point (#6 is where it starts to change, but we're over 8 TS by that point).
Using these 5, plus the 8 CS meals (per person), plus 8 snacks (per person, avg $3.50 ea= ~$120) gives us an OOP cost of the stuff on the dining plan of: $1301.22. So, you'd save ~$60 by using the plan if paid in full. (Note that the CS on this savings is pushing it too, that's a lot of extra food off plan)