For a building, I will then generally do a footprint drawing or cut, to work out my foundation etc. and also to do a materials list from. It helps me count up how many 2 x 4's etc. I will need. I was also calculating my roof pitch and such and, as you can see from the many scratched out places, I had trouble remembering the formula to figure rafter lengths! It had been so long since I have done that I messed up several times. So, see, even those of us who build can forget if we don't keep in practice. I finally saw what I was doing wrong in the formula (I could remember that part) and figured everything out. Still, even with the drawings, I ended up changing things as I built to save on material and such. For instance, the front wall is not a full 8 feet tall and the roof pitch is not a full 3/12. So, I don't know if this helps anybody! When I built the house we pretty much went by the drawings but we might occasionally move some framing just slightly. On something like a shed or so however, we might move stuff quite a lot.
So, I guess to answer the question; I do make drawings but they are just a suggestion! and to help me make up a material list. Also, since I often built with salvaged material, I have to go with what I have sometimes and that affects framing, looks etc. I guess my artistic side allows me to "go with the flow" on building.