Well, i have to say that i don't really like Disney anymore. They haven't made anything good since the early 90s...
Dreamworks makes some cool stuff tho, but i'm kinda guessing that the whole thing is like this:
Disney /still/ make things for kids, something we no longer are, so we don't like the new stuff. We get a kick out of the old things from when /we/ were kids...
Dreamworks is aiming for an older audience, something we became. So therefor, we are now liking their stuff more than the things that Disney makes... Their style is also more "mature" and "up to date" with how /we/ like things to be, which is an area Disney kinda haven't leaped into yet...