It’s a mixed bag for sure. If I hyperfocus on a project I care about then I’m at least happy about the progress, and I do enjoy the process while it’s happening. But if I hyperfocus on some frustrating ass task that I thought would take 20 minutes but ends up taking all day then I feel less good.
Either way, at the end of a big hyperfocus session I feel like I squeezed all the brain juice out of myself.
I had a job interview at the end of one of those once and I felt so brain dead I was forgetting basic words. I literally apologized to the interviewer about it. Luckily she was understanding.