I had a three foot bullsnake squeeze me when it was wrapped around my neck, too. Had to go to a mirror to find the tail and get him off. That's when I made it an ironclad rule to never let a snake of any size wrap all the way around my neck.
Another time I had a 6 foot Burmese python wrapped about my arm. He wanted to go, and I wanted him to stay, so I had one hand holding him rather tightly about a foot back from the head. He tightened down on my arm and squeezed all the blood out of the skin. It wasn't painful, but I could sure feel the pressure.