These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
That One Level: From a meta standpoint, Clamor Plant; it's the longest and most complicated dungeon thus far, spanning six long chapters due partly to the immense amount of detail in the dungeon. The fact it also includes a variation on the Escort Mission that involves keeping with and properly building the Boss Key as it travels throughout the factory doesn't help matters. As FerreTrip says in the author note of the first chapter, "this, kids, is probably why you've yet to see a ton of Zelda dungeons that are supposed to believably function as true structures."