Personally I hate quests with spiral staircases, can't run up them smoothly, constantly have to alter position when navigating them, long ass boring and serve almost no purpose, a transitional elevator would be so much better, looking at Vecna Unleashed as an example, I hate those Spirals
Barovia ones can be annoying too, but bit wider, and more to do on them, can jump down them to get between floors too, still annoying though, especially the long ass one to the Hags the second time you go to the castle
Sharn Spirals: F*$%!
Feywild doesn't have many long ones fortunately, but I skip as much of the final quest there as I can cause they're still annoying, and the map in the prison is so badly broken all the time.
Coal Chamber: Not exactly spirals but still annoying, at least there are mobs to fight on the way up to break the monotony, have fun falling off when the game stutters or rubber bands you though...
Caverns of Koromar: Just feels way way to long for the exp...
Proof definitely needs another shrine, and the quest giver to recommend taking in the Shield or Nightshield spell, not that people will read it, but might help warn players