Can't really fault Disney on preshows. They're an integral part of the experience and provide necessary backstory, ease ride ops and hype the main attraction. Disney does a good job there IMO. Universal Studios on the other hand uses preshows to ill effect. Case in point:
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An attraction comprised of nothing but preshows and an exit.
Man, that is low hanging fruit. Watch that space for something better in the near future, they are well aware of what it is.