Your future self might appreciate just a little documentation. I recently learned that lesson after taking a year off from side projects. I’m currently having to retrace my steps because I no longer remember any details.
You're right on this, of course. I should make myself do it. One thing that helps is I'm an inveterate commenter. Sometimes big blocks on the beginning of a class as well. That helps a bit in remembering how things work years later. Cause most definitely it is not in my brain anymore.