I haven't checked into the TIW. Like you stated, I've already worked up a spreadsheet with estimated cost. It helps to budget for tips also.

Those table service add up quick!! Free dining where are you??
Looks great!! You have some great places!!
You'll get all kinds of different answers when you ask that question. It's different for everyone. There are plenty of people who are totally against it, and just as many who love the DP. DH loves the DxDP. I could take it or leave it, but if it makes DH happy, we do it.

For us, we don't want to be stuck eating counter service the whole trip, which is what we would do if we didn't have the DP. It works for us.
I love making the reservations! I make up invitations that "Tinkerbell" delivers each day to tell us which restaurants we are going to. Until the invitation arrives, I'm the only one who knows what restaurants we are going to. Everyone decides together what we do for lunch.
DxDP gives you 1 appetizer, 1 entree, 1 dessert, and 1 non-alcoholic beverage per person per meal! It can add up to a LOT of food! Several meals we got a brownie, cookie or something we could take with us for dessert. Also some restaurants have large appetizers that cost two appetizer credits so we would get that and share with the table.
We do two sit down meal a day, but like you said all of our breakfasts are early morning prior to park opening. All but one day we were done before the park opened. It's a great day to start the day, and we were ahead of the rope drop crowd!
Welcome!!