I use bullet journals, and I have one for work. It's not exactly the same - instead of my thought process it's mostly what tasks I'm working on each day, and meeting notes. It helps me to organize what I what to get done so I don't have to keep thinking about what I want to get done. It also helps me to get an idea of where my time went, and is a good place to write down anything I want to refer back to. Like when a coworker trained me on a deploy procedure I took notes, and added a line for that page number to my index.