There were several when I saw Maiden back in September 2022 at the Pond in Anaheim (where the Anaheim Ducks play). The entire floor was GA. Had it been Priest, I have no doubt, there'd have been a big-ass pit for Painkiller.
A pit for IM is still pretty iffy from my experience. It's happened, but not at all the GA floor IM pits I've been in. Maybe the NYC crowds just suck. I think it's entirely possible. Obviously I've seen plenty of shows where the crowd is wild, but not usually for the 80s and older bands.