The only thing I don't like about Totorak is the fact that it's so long. That or ARR spoiled me with its multiple loading screens. But I remember to this day thinking that Totorak was the longest dungeon I had experienced up to that point and that feeling hasn't changed.

Problem is, FFXIV won't make any changes that deviate too much from the safety it set with its theme park model. They may risk losing customers by doing so. I would like to see more dungeons where we get to actually explore, not just run through a corridor killing mob after mob, like an arcade. I just recently finished HW and that exploration thing we unlock in front of the airship landing in Ishgard seems just like what I just described, but I can't say for myself as I haven't played through it yet.