I think a confusion between “drawing” and “drafting” could be that drawing is a superset of drafting. Drawing can be any kind of image making with pen or pencil, while drafting refers to carefully made drawings with the aid of straight edges. All drafting is a form of drawing, but not all drawing is a form of drafting. Once in a while, you see the phrase “technical drawing” to refer to a drawing that was drafted. Sketching means typically fast and freehand; quite the opposite of drafting.
That’s traditional media. What do you call what we do in SketchUp? That’s hard to say. When you use the mouse, and eyeball everything, it’s more like sketching, while typing specific dimensions into the VCB to carefully make something is more like drafting. Just call it modeling, and you can avoid it all together.
I have always wondered what the German word for drafting is, as opposed to drawing in general.