Hello,
We took our daughter for her first trip when she was a little over a year. It was fun, and you're right that it's a different experience. I loved seeing her face the first time she saw fireworks, and Mickey Mouse, etc. But there were more breaks & nap times.
Baby swap rides as listed on Disney's website. Definitely take advantage:
Magic Kingdom Park
Frontierland
Big Thunder Mountain Railroad
Splash Mountain
Storybook Circus
The Barnstormer
Tomorrowland
Space Mountain
Stitch’s Great Escape
Tomorrowland Indy Speedway
Epcot
Future World
Mission: SPACE
Soarin'
Test Track
Disney’s Hollywood Studios
Rock ’n’ Roller Coaster Starring Aerosmith
Star Tours® - The Adventures Continue
Twilight Zone Tower of Terror
Disney’s Animal Kingdom Park
DINOSAUR
Expedition Everest - Legend of the Forbidden Mountain®
Kali River Rapids
Primeval Whirl
When we took our daughter, our favorite rides with her were: It's a Small World, Dumbo, Peter Pan, the carousel, & Philharmagic (she actually wore the glasses and was in awe!). Have fun!!