I grow a good number of different D. binata clones. Dormancy in this species is a matter of whether you can afford them the hight light they require for good growth. They tend to go dormant with colder temps, and remain active in growth if warmth and, most importantly, LIGHT is available. Dustin, considering you grow in a GH in Upstate NY, I would suggest that you let the plants go dormant if the temps are low enough to allow it: this will serve to conserve the gains they have made in the summer, otherwise the dim conditions of a NY winter will probably lead to etiolated growth. I find a Sarracenia like dormancy suits them just fine, and they return pretty much as the Sarracenia do. For me, this means dormant plants dont attain a good full form until somewhere around the 4th of July, which is when the pitcher plants also start looking typical around here. Your pitcher plants looked good long before mine did, so this would probably hold true for the D. binata as well. You also have the option of adding some light, but flourescents barely do the job: it's difficult to get the lights close enough to the plant crowns due to the heigth of the leaves. With HID lighting, this is not so much a problem, and when I have had the lights I have allowed the plants to grow over the winter months, which they are very willing to do. If you opt for the dormancy, keep the plants just moist not standing in water.
Hope this helps!