Planning will be the key to your trip imho. It depends if you wanna do 2 or three meals a day. If you space them out and do a ton of physical activity 3 meal on DxDP are very possible with time factored in.
Breakfast
I would plan for breakfast before rope drop. Most restaurants have a 7:30 am breakfast. This might or might not require transportation on your part. Taxi cabs on disney property are fairly cheap $5-10 and they will save you tons of time. I would plan your breakfast in the park you plan to be for that day or in the surrounding area.
For example on Magic Kingdom days you have a huge choice. Crystal Palace and CRT if you want to stay in the park, and tons if you stay on the monorail.
For Epcot days you can go to the princess breakfast inside the park or hit the Yacht and Beach club and go to captains grill or cape may character breakfast. This is a short walk or a beautiful boat ride back to the park.
For HS you can eat at Hollywood and Vine in the park, or hit up the Yacht and Beach Club. This would be a 30+ walk or a beautiful boat ride to the park.
For Animal Kingdom I would totally recommend Tusker House. If not Boma is a short bus ride from AKL back to AK, but i would recommend sticking to Tusker House.
Lunch
For lunch I would stick to a table service restaurant in the park that you are visiting that day. Traveling out of the park will just take up too much time. Unless you are at Magic Kingdom then the monorail is a ride in and of itself.
Dinner
If you are doing a Signature Meal I wouldnt go back to your resort. I would simply dress up a tiny bit more for your day. I would go with a polo for the guys and if its hot a nice pair of khaki shorts. You will see people there very dressed to very casual. If you hit it somewhere in the middle you will be comfortable all day and through your meal. I would plan your signature meals on Magic Kingdom days or Epcot days. This makes for a quick monorail ride back to the park. You can also plan Cali Grill in time to watch the fireworks from there. That will make for an amazing view with a totally different perspective.
If on the other hand you just want a one table service meal try staying in the park. Say you really wanna try the food at another resort a cab would be a huge time saver. It could save you 1.5hour or more in travel.
Here are a few sample days you might enjoy.
MK day
7:30 O'hana breakfast - you should be at mk in time for rope drop
12:30 The Plaza
5:30 Chef Mickeys back in time for fireworks
or with a signature
7:30 Chef Mickey's - you should be at mk in time for rope drop
12:30 a light snack in the park
7:30 California Grill - watch wishes as you eat your desert
Epcot day
7:30 Cape May - you can take a bus if you want to be at the front of the park for rope drop
12:30 soo many choices in the park
7:30 soo many choices in the park
or with a Signature
8:00 Akershus - done in time for rope drop
1pm light snacking/drinking around the world
7:00 Le Cellier or Bistro de Paris in the parks or tons in the Yacht and Beach Club area. This will get you back in time for fireworks
HS day
I would do this with Signature.
8:00 Hollywood and Vine. If you dont want those characters Cape May is a good choice.
1:00 light snack in the park
5-6:00 Brown Derby -Fantasmic Package time depends on show time
AK day
8:00 Tusker House - in time for park open right next to safari or a short walk to EE
1:00 Rain Forrest Cafe(at the park gate) - widest selection for the whole family or you can do Yak and Yeti in the park
6:00 Boma (only if your family is open to new food experiences) If not head to DTD or another resort restaurant. This park closes early so you wont miss anything.
or with a Signature
8:00 Tusker House
1:00 Flame tree for a light snack or meal (walk all the way back it winds for quite a while for a wonderful water view while you eat)
6:00 Citricos or Narcoossees then watch wishes on the beach of the GF with a nice adult beverage
Hope this helps. Have a wonderful trip!!!!