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There is a tremendous amount of shaking in a light aircraft most of the time
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Not that much, no. Yes, I do know. I've flown around England in light aircraft in all weathers for many years. The only kind of buffeting that I've experienced that even approaches that shown is at very low level (<1000ft), and with gusting windspeeds in excess of 35kts. Yes, you do get 'bumps' with turbulence and convective action, but they are of large amplitude and very low frequency.
A more realistic depiction of turbulence would be dropping a wing as you fly through the edge of a gust, or the VSI indicating large variations in climb or descent with consequent movement of the pilot's head. Perhaps also the 'wobble' that you sometimes experience when climbing through the top of an inversion layer and encounter a bit of windshear.
One interesting point to note is that the stall buffet is sometimes called the 'nibble'; which is a useful change in terminology, indicating that it is so light in certain aircraft that you won't notice it unless you're paying attention. The Pitts will give you virtually no warning at all, except for the extreme rearward position of the stick.
Another thing is that the ASI needle doesn't really rattle about in turbulence like the video shows, the inertia of the whole ASI system & bourdon tube is too great for it to do that. However, going through windshear you will sometimes see the needle rise or fall a large amount, dependent on the amount of shear. Very scary on final: Add power, go around, and be ready for it next time.
Nevertheless, I am seriously impressed by that video; very, very close to the real thing. Congratulations are to be extended to all involved.
W.