Lady Matilda
I don't agree. I flew BA146 shorthaul and am flying B777 both long and shorthaul, and I can tell there is a difference. You actually feel more exhausted after the same flight on a BA146 than on a B777. I also experienced headache on some occasions.
I never had problem on B777, that is far the best A/C I have ever flown.
By the way, my company explains all the tralala about the engines and the packs on the basic F/AS course.