Lonewolf - except for one thing. ALL prospective helicopter pilots still continue to fly their first basic machine - for real. Correct me anyone, if I am wrong, but we haven't yet gone down the road of our FW folks where you could technically fly from start to finish prior to going live - in the sim.
So a helicopter pilot flying in a sim, will almost certainly know how the real thing feels, I would suggest.
Motion is critical to the pilots feedback in my experience. Without it, they notice most of the time.
Parallax hasn't been a major issue for most either, especially these wrap round bubble out of the window projections.