Great video Zaelu That would have been fun to make.
No I haven't flown with a camera mounted on my head, but I do understand that the brain is good at filtering out the distractions like head shake, so that in most circumstances you do not notice it.
Until you try to do something like line up the sights of your fighter and that when it does become very important and noticable. ( Post and ring sights were worse but the reflector sights did have some leeway)
One of the concerns I have is that gamers will go into simulated aircombat and perform all sorts of combat manuvers taking shots at the edge of the envelope when in real life they would not be able to keep their sights on-target. The head shake is one of those methods to simulate the difficulties involved.
And in my opinion I don't think they did too bad a job in the posted video.
Cheers!
My wife has just told me I'm spending too long on the computer