I was told by a CM last year that the bus drivers at DTD check resort IDs to ensure people weren't using the buses for that purpose.
I asked as I was working out a route from OKW to WL and thought getting the boat to DTD then a bus to WL. In my case as I had an OKW resort ID and an ADR for WCC I was told I would be let on the bus.
Not sure how vigilant the bus drivers are but thought it worth mentioning...
That used to be the case years ago but now they even have a sign out in mornings telling you which resort bus to catch.
Paul