Disney's animated films have for the most part held up as well. You can still count on fairly well received and attended "revival" performances when those are done, and Disney DVDs through a combination of the source material and the enforcement of "vault" standards are still big sellers when they are on the market.
Live action is the real weak spot in Disney IPs - POTC is really the only recent strong spot from inside the walls, but I'd also be willing to argue that live action has *ALWAYS* been a weak point in the Disney empire. For every "Mary Poppins" or "Black Pearl" there are a dozen "That Darned Teenage Dancing Cat Plays Football With Twins" or what have you.
But overall? I'd say Disney's internal properties have long had a strong impact culturally.