I've traveled with a sweet little one year old, too!!
Things she liked at 11 months old. . .
The dancing fountains you can play in. The ones that come to mind are MK's in the kiddie section (I think it's called Donald's tug boat) and right at the end of future world/into the countries at Epcot.
MK:The Country Bears. Even the teacups were a blast, with no spinning of course. Winnie the Pooh ride, small world, Pooh Playplace. AK: The Nemo Show HS: playhouse disney, muppets. AK: Triceratop spin. Epcot: Journey into Imagination, Nemo)
I think the best way to get them 'into it'. . .and I know this sounds a little silly. . .is to sing theme songs to rides BEFORE you go. You know "yo ho, you ho, a pirate's life for me" or 'it's a small world after all' or 'imagination' (figment at Epcot) that way, when brother hears them at Disney, they are familiar. Trust me, he'll be so excited.
Along these same lines, the playhouse disney show at Hollywood Studios is very fun and interactive, and young ones usually recognize bear/big blue house, tutter, stanley, tig and pooh from watching them on TV.
Her fave character meal by far was The Crystal Palace with Pooh or HS's Little Einstein/Jojos at Hollywood and Vine.
As for tips for mom and dad. . .take your own stoller, they are more shaded and comfy, lollipops for an emergency fuss in a quiet attraction, and those water jugs with a sprayer and a fan. Keeps them entertained for hours. Be Cool patches (the things they sell at the pharmacy for fever)
Familairize yourself with Baby Centers, and take advantage of more 'mature' attractions for cool dark naptime (Epcot: Universe of Energy, The American Adventure. Animal Kingdom: The back, left corner of walkway at Dinosaur. MK: Walt's Dream movie on Main Street, sit right inside the entrance to Pirate's while older family rides Big Thunder and Splash; The Hall of Presidents. HS: right inside Tower of Terror while older ones ride TT and RnR Coaster, the back side of Muppets 4d, inside or actual ride. . .Great Movie Ride)
Hope this helps!! I know you'll make alot of great memories!!