yeah, I think it almost used to be that the things were really made for the adults who would be paying for the cinema tickets or the video releases, so they tended to primarily deal with more mature themes but had some childish jokes thrown in for the kids...
...and nowadays the opposite is true - childish themes, adult jokes that go over kids' heads thrown in here and there. UP! seems to be the exception here. That's probably my favourite of the more recent Disney stuff.
But I don't mean to derail this thread - We're supposed to be talking about the 1990s, aren't we?