As most have said, the answer to your question is truly "It Depends". However, a couple things for consideration:
1. With the
DDP, everything is prepaid and you wouldn't have to worry over budget or cost while there.
2. Having the DDP allows you to try some things you might not normally try. For example, one of you could order a "safe" meal, something you know you would like and the other could order something a little more exotic, then split both. Maybe find a new favorite!
3. A previous poster mentioned not being able to just stop and eat when you wanted. That is incorrect. DDP does not require ADRs. However, ADRs do make it easier to ensure that you will be able to get in to a restaurant you want without a very long wait. Also, ADRs are not exclusive to DDP. You may make reservations even without DDP.
4. You may want to look into the QSDDP and then make one or two reservations for table service meals while there. After all, it IS your honeymoon!
5. You mentioned that you typically don't order soft drinks or desserts when dining out at home. My family and I usually are in that same camp but more for the cost issue than preference. So if that's you as well, the fact that they are included in the DDP might give an extra excuse to splurge a little. Also, you will be doing a LOT of extra walking at the World so that dessert won't have quite the impact on the waistline as it might at home.
Whichever you decide, it will be the right choice for you. It is your honeymoon and should be a stress free, magical time for you! ENJOY!
And Congratulations!!!!