Not that often, but my search tools aren't very refined yet so it's probably a bit of a chicken-and-egg problem. The technology is advancing rapidly right now so I'm not putting a whole lot of effort into polish yet, since in six months some dramatic new tool might come out that invalidates everything I did so far. Like that potential WhisperX switch.

Most recently, I remember a situation where I didn't remember the name of some NPCs from a roleplaying game that were only in one or two adventures. I did a little searching and found them in a transcript from 2017. That was fun.