Yup very true. For awhile I even had different "personality classifications" with my bloods -- ranging from "strike and pee when looked at from across the room" to "jack-in-the-box in the tub, tame when worked with" to "big lump."
What I dig about the BPs though is that that vast majority of mine are just so totally tame and handle-able when out of the tub, even if they have a pretty killer feeding response when they're in it (like my banded normal girl who tried to eat my finger the other day ...) It's just fun to have a few racks of snakes that I can just take out and handle without having to worry about getting nailed every time.