I cannot recall a single post about hating leveling dungeons; the people who want to speed run them simply do so without complaint. The time those players post about the subject is in defense of the practice in posts like these that try to paint them as villains for doing so. You are being very disingenuous here.
The world is just not this binary; never has been, never was. It’s just another fallacy that has fallen out of the current echo-chamber led internet world we exist in today.
Just because someone wants on aspect of WoW to be efficient doesn’t mean they will make all decisions out of max efficiency, especially when talking about an external cost. Sure, forking out $60 for a boost will save time over leveling, but perhaps I’m not willing or able to shell out that $60 for the boost. I may choose to go the leveling dungeon route over paying $60, that doesn’t mean I won’t still care for the efficiency of being able to complete a leveling dungeon in a few minutes.