>The one thing they've consistently nailed has been tip-of-my-tongue style "reverse search" where I can describe a concept in sufficient detail that they can tell me the search term to look it up with.

This is basically the only thing I use it for. It's great at it, especially given that Google is so terrible these days that a search describing what you're trying to recall gets nothing. Especially if it involves a phrase heavily associated with other things.

For example "What episode of <X show> did <Y thing> happen?" In the past, Google would usually pull it up (often from reddit discussion), but now it just shows me tons of generic results about the show.