This is why your opinion is different to the general consensus. You are an "experienced leveler". I've personally always hated leveling through quests cause I liked doing 3-4 hours of dungeon spam, then chill for a bit, then go back to it etc.
Now dungeons are a no-go. Not only are they not efficient, they are HARD. I have to work harder on my prot warrior to not get killed in a 2-pack pull than I would have to in a regular +15. That should NOT be a thing.
Also, I've always thought leveling took too long. The real WoW for a lot of people starts at max level, and a lot of people DO NOT enjoy leveling, but have to go through it. Why make it harder for those people to enjoy the game so that a small part of the WoW community, that labels themselves "experienced levelers" can have a "new" experience?