I'm a physicist by day, and work for a company that makes measurement equipment. A lot of my work is quantitative, so I'm frequently "thinking" with numbers, equations, graphs, etc. While I'm not employed as a programmer per se, I use scientific programming quite heavily.

Jupyter has helped me take notes when I need to "think" quantitatively, and be able to look at answers quickly, plus maintain a record that I can read later on.

Not OP but I also use jupyter for almost everything.

Jupyter notebooks are great for capturing thought process and showing intermediate state of whatever it is you're doing, which means coming back to them even years later it's a lot easier to recall your own thoughts and not have to reverse engineer a monolithic block of code.