I just reread your original post. If the flights leave a 7:50 in the morning and you are two hours from the airport, that would mean leaving your house at 3:50 in the morning, or driving to the airport the night before.
Here is what I would do in your situation. As soon as everyone gets off work the day before, hop in the car and head South. Depending on your driving style, you can get 4 - 5 hours out of the way the night before. Stop in a hotel, then head out the next morning on to WDW. You will actually get there before or about the same time your flight did, and you won't have to get up at an ungodly hour of the morning. You don't have to lug car seats, kids through the airport. You can pack any size juices, snacks you wish for the little ones, etc. The little ones are not bouncing off the walls at the airport while you deal with flight delays, security line, etc.
Just make sure you pick a hotel that is easy on, easy off the interstate, and pack a separate bag with your one night of essentials. Then bring in only that one bag and your bag of electronics/valuables.