That snakes have a small ability to "learn" has been researched and theorically proven (darn, can't remember the link).

Have any of you had escapes? If you have, have you noticed that your snake keeps going back to that weak area to try again? This is evidence that they retain some memory.

Therefore, my vote goes to..."Yes." It's possible that they do know who we are but not in the context of "ownership."

btw: if your bp is always biting you..it's possible that, "He's just not that into you."