Unsurprisingly this is also a characteristic of low-hour rotary pilots when hovering. The cyclic is whipping around the cockpit like something from a cooking lesson, rather than a flying lesson. Eventually, they begin to understand that rapid application of left cyclic followed immediately by right cyclic equals exactly zero, and as confidence grows, they begin to calm down. The other parallel with these videos and comments is when on more advanced helicopters the auto stabilization was deselected, most pilots reverted to stick-stirring, but pilots who had more hours on manual only control systems instinctively understood that less control inputs made for smoother flight.
It all comes down to understanding primary and secondary effects of controls, understanding input lag and aerodynamic reaction times, and ultimately understanding that inertia is your friend, not your enemy. Plan early, plan often. Experience is almost certainly a factor of confidence, and unfortunately if flying with the autos disconnected is rarely practiced, it's hardly surprising experience and confidence levels suffer.
Sometimes it's just better not to know what's going on the other side of that door.