It's a double-edged sword. I don't spend much at all at the bars anymore with Disney because I'm so worried about a surprise bill at the end of the cruise. (Yep, happened to me once. Wasn't the end of the world but I wasn't happy.) Don't want to go back to GS constantly to check my tab. Spending my vacation constantly reconsidering things, telling myself no when I want something doesn't = fun. When I researched drink packages prior to our
RCCL cruise most people said they didn't drink their monies worth even when they tried. It's too much. I'm still fine with pre-paying for the convenience. Definitely some $$ being left on the table.
RCCL stopped requiring everyone in the same stateroom to have the same package and they seem to be doing okay. At least when they restructured their packages in November 2013 that was the case. Not sure if it's changed again since. I don't think it has. Thing is, if you're sitting in a venue with friends/family you can't relax and be supplying drinks to everyone at the table/bar. You'd get busted. All the sneaking around to hand off drinks & things eats up time & energy. That's not a worthwhile thing to do either.
I'm just looking for low stress convenience. Paying per drink sticks out like a sore thumb after I've enjoyed an all-inclusive package.
As for the drunks, I met 2 couples on the Fantasy a couple years ago that were Florida residents. They were really cool people, told us they were only onboard because FLR rates + they could bring all the liquor they wanted to onboard so they wouldn't have any bar tabs. Disney's policy about bringing on as much as you like is just as likely to encourage excessive consumption when you think about it. And look at that $$ Disney left on the table! Everyone knows Disney cruises tend to be more pricy. So keep those prices above the rest + offer the packages. You'll eliminate your younger partying set for the most part right there.