I am constantly adjusting my lane position. I do not see it as wiggling or weaving, I see it as that mentioned deviation from static position. The same reason to always pedal to present the idea you are moving ahead at speed and not coasting.
Otherwise if I am on the shoulder I will ride and avoid obstacles as needed. I am always watching behind me and planning ahead for lane changes or stops. If I do need to move into the lane I will likely move to at least the center to convey the message that I am there and you need to watch me.