Sure enough, some of the repeater pairs that I have programmed in are active up here; and it's quite interesting listening. There's one repeater in particular, 147.135 MHz upon which I have heard at least a half dozen or so QSOs on the subject of D-Star. It appears that there is a group of Hams up here in the Adirondack region that are quite hot to get a D-Star network going.
I have heard Northern New Jersey and New Jersey in general being referred to as a "hotbed" of D-Star activity. I wish I had the correct PL tomes programmed in, as I could easily set them straight. Yes there is some D-Star activity in New Jersey; but I would not characterize it as a "hotbed". There are only one or two groups off the top of my head that I can think of that are actively using D-Star. Nowhere near the majority of Hams or repeaters.
Amazing how false information gets started going around. I am sure this happens quite often and is probably the way that "Urban Myths" originate and propagate.
72 de Larry W2LJ