Hi Robin!
My three have ALL been at a very young age, and there are TONS of things for them to do! In fact, there's only a handful of things at each park that your 22 month old won't be able to experience because of height requirements. Here's the breakdown:
Magic Kingdom:
Big Thunder Mountain Railroad
Splash Mountain
Space Mountain
Stitch's Great Escape
Tomorrowland Indy Speedway (requires passengers to be over 1 year old)
Epcot:
Soarin'
Mission: Space
Test Track
Disney's Hollywood Studios:
Tower of Terror
Rock 'n' Roller Coaster
Star Tours
Disney's Animal Kingdom:
Expedition Everest
Dinosaur
Primeval Whirl
Kali River Rapids
If your little princess is a Disney Junior fan (like mine!), make sure you spend some time at Disney's Hollywood Studios. Disney Junior - Live on Stage! She'll get to see some of her favorite characters in the show, and the little ones just LOVE it! (ok, I admit...I do too!!)
Have a magical vacation!
Amanda