Only time I ever drafted was on a climb. I did not want to immediately overtake and then maybe blow up as he was not going that much slower than me, so I sat in for a few minutes and then went back to my desired watts and overtook.

I think drafting is dumb, you're on the open road, you're not a pro, you don't know the other person, just don't do it. Obviously with people you know it is a different story.