skiresort.info is an excellent resource for:
1) A comprehensive list of ski resorts, even obscure ones in exotic locations.
2) The site for each resort nearly always includes a trail map.
It never occurred to me to consider their star ratings.
Beginner-friendly ski resort
ratings operate on the wrong premise. The best beginner resort is one close to home where you can climb the learning curve skiing lots of days (partial days for young kids) at low cost in time and $. The SoCal locals were quite effective for me in that regard in 1977-78 and 1978-79.
Skiing a large resort during early season is enough for me to get a sense of a mountain.
Yes and no, and depends upon topography and how large. I skied Stratton, Sunday River and Sugarbush in early December 2018, all about 35% open. I had favorable impressions of Stratton's Ursa groomers, but never saw the rest of the hill. Sunday River sprawled at far distances left and right of the central chairs that were running. We had fresh snow at Sugarbush and Liz showed me a couple of interesting natural snow trails but I never saw Castlerock or Mt. Ellen. I don't think many Easterners would say I have an "adequate sense of the mountain" based on those days.
Stowe and Mad River, skied comprehensively mid-March 2003, yes I think I have excellent senses of those places.
As for worldskitraveler, I say he has zero sense of Taos or Crested Butte. At Taos he rode a lift over Al's Run and may have looked up at Kachina Peak from the backside. But in CB's case, you don't even get to see the North Face terrain if the lift is not open.
In my case, I could look up at Pila's closed upper lifts, but at Aletsch I never saw the large sectors that were closed.