I have been keeping GTP for 15 years and I only mist during shed cycles and sometimes during breeding season just too "chill" the animals a bit more. They are like Carpets on a stick. Husbandry is not much different at all.
As far as them being the new Ball Python, GTP have seen their day for high-priced animals. The import market has killed the CBB market over the last 3-4 years. Carpets on the other hand are a different story. With all the morphs available now, the combos are going to start popping up in the next year or so. They should gain in popularity.