As other posters have pointed out, booze is already very useful. However, drunkenness isn't. I don't think any of my characters has gotten drunk from booze in the last 2-3 years, and it's a pity.
I think the drunkenness feature could be given a bit more protagonism in some way... be it by giving it some boni so that players will get drunk voluntarily, or by creating a quest (a drunken fist duel?), or by making it easier to get it involuntarily (in theory you could get drunk from pool sipping but this is extremely rare - maybe there could be a special room smelling of wine where you got drunk if you stayed for a while).