but if you press B2 look, release the joystick and release B2, then press B2 and look again, do you get the creep?
No.
As long as you press the look button before you press a direction, you will not get creep, regardless of how many times you switch directions of looking, or look in the same direction.
The problem with the mapping on the 360 is that it allows the direction to get triggered for a millisecond before it registers that the look button is pressed.