The Road to El Dorado was from Dreamworks, who never produced kiddie films to begin with...
. Oh, and just to update you, Atlantis was quite violent and some of the jokes in there could be considered crude, but so was The Emperors New Groove, but it's not really that horrible. In fact, I think it's made many newer disney movies more enjoyable by both audiences. The problem doesnt lie within the joke being adult oriented or not, the problem lies with how its done. Most, if not all of that humor and violence was done rather tastefully, and soared right over kid's heads.
For example, the joke about Little bo Peep getting someone else to watch the sheep was hilarious, but done in a way that both kids and adults got the joke. The adults got the deeper referene and kids laugh at Woody making googlie faces and noises when bo-peep gets close. So the point is that good humor doesnt have to be George Carlin cursing at 90mph (though I do find him to be entertaining, especially his views on the world =^), but can also be rather clean.