Just to raise the number from 0, I did exactly that. The post-doc was in a research institute, a department that focused on usability. It seemed worthwhile to learn how to really do user tests and usability evaluations in practice, in the best way possible academically (or so I thought) but with real enterprise projects. Contrasted a lot with the quite theoretical PhD.

We can always argue about whether it was worthwhile ofc. Moneywise, definitely not (though the pay wasn't all that bad compared to industry compensation in my countries). But I learned what I wanted to learn, and the issues the position had were speficic to the place, not the concept of the position, if that makes sense.