A year plus in I'm starting to notice an actual mental payoff to not drinking. Yes -- even above and beyond the lack of daily hangovers.
A, um, new kind of internal strength. Sharper focus. Remembering more day to day, being more aware of the subtexts to a conversation. More aware of what I want from the world long-term/how the world should/could be. What needs to be done to avoid getting killed on the road or run over by my professional life. More aware of how individual and family dynamics evolve and relate. Of the need for closeness and clarity. Of how beautiful Spanish is on the page.
Even hanging out in drinking situations has gotten easier. A fun project to match the trajectory people take when they drink and loosen up on your own. In a way I actually over-compensate and loosen up further than people. So I'm the asshole who says the wrong thing with no relevant cultural pretext to back it up. Crackpot role to relish.