Yes, they do recycle the jokes and it gets mundane after a while.
The "Captain, if you are here, who is driving the ship?" one got a chuckle from me on our recent cruise (Disney Dream) .... he took that right into his answer, "don't worry, we have other captains on our ship .... there is Captain Mickey .... Captain Jack Sparrow ....".
I'm sure that one gets used by all the Disney Captains ,.... but it was funny hearing it for the first time.