Knowing the mountain obviously helps a ton too like you are saying.
Even BW has groomed trails that always seem to be a little icy (Starr King, Deception Bowl, Darby's Drop, sometimes Zealand and Water Tank) unless the conditions are just perfect across the mountain.
We blast around over there with our eyes closed and can tell right away if it's one of those days where the usual suspect trails will be rough, so we avoid them.
When we went to Sunday River and Wildcat the first time it was all exploratory and we had a lot of mixed conditions. Now we are learning those mountains better too.
For the weekend warriors who come up once a year, yeah I can see the challenges at any of these mountains.