5 kids!! Me too!! Mine are all a year apart and we have been going to Disney every year since the oldest was 3 mo. (Husband has a winter conference in Orlando, so we stay on site).
Snacks in the backpack.
Here is what works for us!
Go to the early entries at the park.
Break in the afternoon.
Buy the largest pass that doesn't expire, 7+4=11 days. That way you don't feel like you have to go the park everyday, and you leave with passes that never expire, and the biggest part of your next trip is paid. It makes it a no-brainer to go again.
Enjoy the little things like walking around Downtown Disney on your non-park days. Enjoy the Rainforest Cafe. At night you can go the Campfire program at Fort Wilderness. This is free. They have Chip and Dale with a sing-a-long around a campfire. After the campfire, they have free movies on a large, Drive-in type movie screen. You can buy a s'more package that includes everything, even the sticks. One package is enough for a family of seven. Only two sticks. The kit is only $5 and $.30 for each stick. The only thing that Disney doesn't hyperinflate.
Enjoy the afternoon nap.
We live in Michigan as well. We find that if we can leave by 4pm, and drive through the night, it works best for our family. The kids think it is only a 8 hour drive!! By doing this, we avoid going through the congested Cincinnati and Atlanta during daylight hours, and we can make the trip in as little as 18 hours.
We eat breakfast in the room, to save on time getting to the park in the am.
Have a great trip! We're leaving next week!

P.S. Walkie Talkies work great in WDW. The older ones don't but the newer ones have a 5 mile radius, and alot more channels.