People do not drink wine or beer as quickly as they drink sodas or iced tea or water.
A restaurant that serves wine and beer will always experience longer stays by guests than ones that serve only soft drinks.
Same menu, same style kitchen, same everything else but change the wine and beer being offered and two restaurants would have wildly different seating experiences if one of them served alcohol and the other didn't.
Not only do people take longer to finish the drinks (and from what I have heard people are allowed to order at least two drinks in BoG per person...so that is one beer or wine that comes to the table when they first sit down and order and then another glass they will order mid way through the meal) but after they've had the alcohol introduced they are less likely to get up right away and rush on to the next activity.
What's going on in BoG will be fascinating for people in the hospitality industry to study because it's the only place in the entire park where the booze hounds can head...so it's like a giant magnet for them. Since this is the only place they can get their fix, then they are going to want to camp out and occupy those seats for as long as they can to enjoy their alcohol.
What a challenge it's going to be for TDO to pry those people from the first seating out of their seats to be able to seat the next round of guests...and I bet it's going to take longer to close the restaurant at night than TDO originally thought, too.