I think that by now, most people have a good grasp on what physx is, and what it isn't. Cryostasis doesn't really change that. (Read: do the survey again today and you will get the same results)
PhysX is nvidia only, cutting out almost half of the market, so physx games can either be nvidia only, or non gameplay physics only.
Also the closest thing i have seen to a totally new experience is cell factor. That pretty much required physX (and hence nvidia). None of the games that used physx for visual effects only have really made me go "wow this is awesome, physx makes it so much better"

