About the same for me. I remember getting back into the room, saying they're going to start the gas, and that was it. Then it's like waking up from a deep sleep.
My WLS was the fourth time (I think) that I've been put under. It really is like falling asleep. They'll let you know when it's going to start and then you're out pretty quick. I do terrible waking up from anesthesia. I'm groggy for hours. Even a full dose of Nyquil before bed leaves me feeling out of it for hours the next morning. Look at it this way. You basically have a guy/gal there where their only job is to monitor you while you're out. They aren't going to be running all around doing other things, taking smoke breaks, etc.
Honestly it's one of those things where once you do it you realize it's not that big a deal. You'll do fine.