Oh heck yes....and you've already had good advice.
I was a finalist
(alas, did not make the final cut) to be an official Mickey Mom....but I am the unofficial Mickey Mom for my colleagues.
Definitely stay on the property...take the airport transportation (you don't even have to pick up your luggage, they'll deliver it to your room).
Use the bus system to get around...it's handy and no parking.
Go when they have the Free Dining option if you can....the parks are slower and you'll eat much better for far less money.
When you have a choice...go left. Most people go to the right.
Parades are fun...but the BEST time to get on the most popular rides is during the parade.
Go early in the morning...most people don't....then back to your hotel to nap and swim and enjoy the hot part of the day with leisure. You'll be back refreshed for evening fun and fireworks...while the rest of the crowd is cranky and footsore.
Bring several changes of shoes and swap them out when you go back to the hotel midday. Gives your feet a rest.
I have a list of busy and slow times (and days) at the parks....I'll share it with you once I get on my other computer.
Hollywood Studios and the waterparks are less walking than Magic Kingdom, Animal Kingdom and Epcot. Alternate them to give your feet a rest.
We LOVE Coronado Springs. It's a moderate resort....with great dining options, a lovely pool and waterslide and a giant hot tub. It also has the big central pool, full of kid rowdiness, and "quiet pools" in the various sections that are open all night and more adult occupancy....no marco polo games when you want to lounge and float.
Enjoy!