king snakes are pretty docile. I haven't ever been bitten by them before. I have been bitten and struck at by rat/chicken snakes and corn snakes but never a king snake. 
rats are fairly docile, Ive been struck at once, this year actually, when trying to handle....black racers though, mean as a snake. Never had a problem with a copperhead, knock on wood, then again I dont handle them. I have watched my boss, unknowingly until he was across him, step across a large 40" or so copperhead and it never made a move. I myself have stepped on an average, 2ft or so, as well as looked down and had one between my feet while in some tall grass, and never been bothered.
I did come across a timber rattler in the NC mts that was coiled up, rattling, and ready to strike (and did at the obligatory stick poke) when I saw it. I was about 3 ft away when I saw it in this position and have little doubt one more step without seeing him would have resulted to a trip to the E.R.
