well since cruise line make a lot of profit off of liquor, they probably smile at the term booze cruise.
But really all the lines especially RCI, CCL, Princess, and NCL have drink packages and push them a lot.
When I hear the term Booze cruise, I really think that is it the main reason folks might be on the ship like for New Years Eve, or quick 3-4 days in the summer.
But for the most part, a lot of alcohol is drunk with meals and is wine. And also in the theatre for shows.