If you loved Horton Hears a Who!, try Ice Age: Continental Drift
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Steve Martino, and they both carry the cozy, playful mood tags, and they sit in Adventure / Animation / Comedy / Family territory. If that's the register that drew you to Horton Hears a Who!, the second film will land in a comparable space — through a different lens.
cozyplayful
What Ice Age: Continental Drift is
Ice Age sequels just keep drifting along. Manny and friends sail the seas on an iceberg. It's more of the same old antics.

