ya, same deal for me, I went out one day no helmet and my top vents on the goggles got completely filled with snow and they froze fogging my goggles up wicked bad. With the helmet this has never happened.
Been riding for nearly 15 years and I don't recall that ever happening to me - and I have never worn a helmet. I also don't ride powder very often.
Anyway, I ordered the Bern Watts - which has a visor. I have Spy goggles that I hope fit.