Erin,
we will be there Nov 19-Dec 1, so our pixie dust may cross paths!
Anyway, having survived many trips with toddlers, some of our favorite attractions -
time to play in parks - toontown play area,Splash Mountain play area, new pooh play area in MK, the fountains in Epcot, all kinds of places can be made into toddler play areas while the parents parent swap.
They liked tom sawyer island, small world and the carousel
They also loved playhouse disney, but liked things like Indiana Jones suprisingly (all of the booms and bangs for my boys now 11,9 and 7) Don't discount many rides/ shows because you think they are too loud or intense - the muppet show at MGM is a big favorite and you can go right out of there into the Honey I Shrunk the Kids play area. Remember all of these shows have exits so try to sit near an end and then you can sneak out if he gets scared (like has happened numerous times to us in it's tough to be a bug)
Also, another good tip is during the day when it is warm, ice to suck on really helps keep them busy and cool and can be gotten at any counter service restaurant. Just ask for a cup of ice.