Well, I have one little 2011 jungle jag, Indra, who is still quite scared & defensive. We joke that he may be related to a god of war, hence the name. I don't think I've ever had him out without him tagging me at least once, but he has gotten much better. I'm pretty sure we've already determined that I'm weird, but I actually like the nippy ones, I don't see them as aggressive, I see them as scared, (this actually applies to all animals, not just snakes).
The "bite and wrap" is usually a mistaken feeding response by a confused snake. Doesn't happen often, and only in certain situations with certain snakes. And I almost always bleed a little, the teeth are very sharp, albeit usually very small as well. With most small snakes, the closest thing I could compare it to its getting your finger pricked by one of the little lancet devices they use in doctors offices sometimes, a drop of blood, press it for 5 seconds with a tissue, and that's the end of it.