Quite often! Like everyone else has mentioned, one moment you're in the OR, and then the next moment they're waking you up and making sure you're alright.

A lot of times they don't even seem to ask me to count backwards anymore, I remember one time I asked if they wanted me to and they said "Nope, we've already started the meds so you should be asleep in a few seconds", I remember getting very sleepy and saying something along the lines of "Oh, well that explains a lot" and then I was waking back up. There was a time where they did have me count backwards, and when I got to 80 they were quite confused - apparently my IV had an issue so I wasn't actually getting the meds (they generally use propofol and a local anesthetic over here, the local one first since propofol can have a burning sensation). They fixed it quickly, had me restart the count, and I don't even think I made it to 95 before being out.

I have never had any negative side effects from it thankfully, but I have noticed that the longer the procedure is, the more tired you feel after you come out of it. It's common for me to fall back asleep after a 7 hour procedure, but for one that is an hour or less once they wake me up I'm generally awake for the rest of the day.