Out of curiosity I ran through the updated dungeons just to see what changed. Heres what I found
Copperbell mines: First firesand moved to the room its needed in so you can't miss it around the corner anymore. Bosses have some fun new aoes, hug hit boxes but really slow, but no more gimmicks, no adds and the slimes divide is just aoe bombs now.
Toto rak: Is a hall way with web walls limiting pulls. Less ochu mobs and a few more pudding and mushroom mobs. One path, no batteries, no sludge. Final boss no longer vacuums on entry so no accidental pulls anymore. He still aims web bombs at players but the room is no longer filled with them like before.
Haukke manor: mostly the same, still need the 2 small keys to progress. The succubuses no longer do that fear aoe upon reaching their first target. The former somewhat dangerous pull 4 mobs and 2 patrolling succubi is nerfed, only one patrolling now and no giant fear aoe. One pack of mobs on the stairs to the basement has been removed. Second boss spawns and aether flow so no more returns. Last boss no more candles to constantly put out and she seems to summon the adds 1 at a time now but we accidently killed her during the second summon. But the manor eyes gaze attack is room wide now instead of a small cone.
Brayfox Longstop: Seems smushed but for the most part the side rooms seem unchanged. between the first and second boss you can no longer cut through the water immediatly to the right and the fish no longer patrol. So no more accidentle massive pulls here. Last bosses arena is much smaller and his toxic is just many small aoes, no longer big aimed ones that he needs to be dragged out of.
Darkhold: The long halls are alot smaller now and the patrolling eyes attack seems to be just a small aoe around it not hiting everyone. Seems to move slower and not aoe as much. Path to the second boss they removed the cliff where the frogs could knock you down into additional packs. Rest seems unchanged still have the clocks to stand in, and exploding crystal hazards.
Stone vigil: All the dragons in the small side rooms removed. 2 of the 3 patrolling dragons where the ice sprites spawn have been removed. One pack of mobs right after the first boss seems to be moved from the path left to continue the dungeon to the dead end on the right there is a chest there now as well.Second boss is completely different, no longer hitting the ice dragon with cannons no more windburn debuff. He spawns tornadoes in the back of the room that move in lines and knock players into the air. Last boss seems to attack the same way as before but his attacks are much slower now.
Not sure how I feel about these changes. They will no longer be a chore to run but what little challenge they had has been removed.