To be honest I don't find it dissapointing at all, if anything we should be dissapointed in the human animal for being such suckers for familiarity.
It's a psychological thing in my opinion; along the same vein of returning someplace where everyone knows your name. I think we feel subliminally comforted by the 'familiar,' so often pieces in pop culture will be re-replicated in small ways to convince us that we can already 'relate' or feel comfortable with that image because we've seen it before.
Think about it this way, if EACH time you visited WDW or DL the Peter Pan ride was COMPLETELY different inside would you have such an emotional/fuzzy attachment to it? Probably not. Those 'templates' are just subliminal 'reminders' that suggest, "you've seen this before, it's nostalgic, & it makes you have a warm & fuzzy attachment to it."
It's all about emotional attachments my friends!
