Does GT get fogged in? Yes. Does having skiing experience in less than 1 chair visibility help one ski at GT? Most definitely.
Is it a great mountain that's very fun to ski and worth checking out? Yes!!
The intent was to get some sense of whether a less able skier in our small group would have an easier time at GT or JH. I think I got the answer on that: JH due to better grooming and more options. I'm personally looking forward to spending time at both places, though since we're staying in Jackson, odds are that it's more likely that I'll wind up skiing JH more often.
This seems to be the prevailing opinion and I hope to do a bit more than merely checking GT out for a day.
Thanks again to all for the suggestions.