It's fascinating how our brains subconsciously process sensory data and react without us even realizing it. It obviously takes a lot of small and not so small adjustments to stay balanced on 2 feet and the required adjustments need to be anticipated.
I love giving people this demo on our rift. One person fell backwards (thankfully I was there to catch them). Most peoples knees start shaking. Best rift demo I've seen so far at showing off its immersion.
The tracking on the Rift is pretty much the thing that no-one's had any complaints about. Your observation could have something to do with the fact that the FOV of the Rift far exceeds that of the TV, making it seem like there's "less movement" than there actually is.
I can't believe that yesterday cracked.com voted the rift number one in the 'five unbelievably horrible kickstarters that were actually funded' article. It's like the writer never bother to research the kickstarters he was writing about.