Never been cut off, but have been asked if I was driving when we arrived. It’s only happened to me on longer flights. I don’t pound drinks, but over the course of a transcon it might seem like many rounds. Practically speaking, a PDC, a predinner cocktail and few glasses of wine on a flight with a 6-7 hr block time isn’t that much alcohol. I’m probably not even buzzy and I’m not very large (~5-9/150lbs).