If the shells were the same as those on Phantom's Revege, how would you hit your noggin anymore than you would on any other coaster? The swinging of the cars is just the natural banking. Your body should move with the swinging as long as it doesn't come to a sudden stop.
I can see its appeal as a "family coaster" (my nephew was just shy of being tall enough when we visited last month and was majorly bummed out about it), but I could easily see them taking it out and replacing it with something better.(I'm actually surprised it hasn't happened yet)
Suspendeds are a rare breed, but Iron Dragon isn't even an especially good one. Perhaps because I grew up riding BBW at Busch, the first time I rode ID (when it was still relatively new), I was overwhelmingly unimpressed.