Having just watched the video above of the 737 pilot and am amazed at the amount of control inputs made by the pilot.
Yes, I was too. Having flown several variants of the 737, I don’t think it was twitchy but it did have a lot of control authority. In that video I see pretty much full roll control being used in one direction, then full control in the other: in the couple of thousand hours I spent in that airframe, I can’t recollect having to use full deflection outside of some sim exercise. I think the second application was almost all to counteract the effects of the first! PIO by any other name...