It comes up in software development sometimes, which is my day to day. It also is useful for any “fast but inaccurate approach” scenario, which comes up sometimes.
I wouldn’t say I’m proud of using it. It was already in my lexicon. (So was “lexicon”)
Here’s an article about them https://www.verywellmind.com/what-is-a-heuristic-2795235
Why do you ask?
I (a guy) think I still have a small plastic off-brand Lego in my desk. I spent a weekend with my high school crush and we found a bunch of them and had goofy fun with them.
Last I heard she’d moved away, married a woman, and had a successful career in science. I doubt she thinks of me, but I’m glad she did well.