We just did a Disney cruise and they have bars conveniently located everywhere, going to the spa… there’s a bar, going to the pool… there’s a bar, going to a show… there’s a bar, going to meet characters… there’s a bar, going shopping… there’s a bar, you’re never more than a few steps from a bar the entire time you’re on the ship. Despite that I can’t recall seeing a single drunk person on the ship.
(We’re old and in our cabin by 11 so maybe we just miss them).
I don’t doubt people have had run ins with people who drank too much in the parks but in all our years of going to the parks, and now cruising, we’ve never had issues with it. Epcot being the possible exception and even there it was just obnoxiously loud people.
I just don’t think Disney appeals to that crowd, a lot of people like a drink or two on vacation but the heavy drinker who just wants to sit at a bar and get drunk is not Disneys core clientele.