@david leigh-smith, we have similar paths. Before studying psychology (degree in counselling) I spent time as an architectural renderer, drafting, and graphics artist. These days, I use MS Paint to quickly draw plans where many measurements must fit all together. Otherwise its a quick sketch to portray a visual idea.
It’s funny how an illustrator can pick up on others ease, or laissez-faire, approach to sketching. Knowing that if they were serious, their output would be quite illustrative. I used to write very neatly. Then I went to uni where note taking had to be lightning fast. Since then, writing is no longer for show but just to get the point across.