I love how you assume because it is Disney it'll be kiddish. That's like assuming everything animated is kiddish.
Name one Disney Animated movie that WASNT PG or G.
Snow White and the Seven Dwarfs does not have a G or PG rating.
Albeit that's because it has no rating...never the less I win.
But seriously, black cauldron has zombies and black magic, fantasia has alcohol and nudity, lion king has quite a few mature concepts such as growing up and responsibility and repentance, just because a movie is rated G or PG doesn't make it kiddie.