I fully feel your pain, but, as a multi-boxer, I *love* the Bravery Bonus. Not just because it makes leveling easier, but because it has greatly changed the way I level my guys. It nips the repetition of quests right in the bud. I am not even positive I am leveling any faster, but I am certainly having more fun doing it.
And of, it isn't the ramped up difficulty of running everything on elite, it is purely the effect of never running anything more than once. I can get all of the way to the mid-late teens that way, by which point I am expecting to be repeating things anyway (and will be getting useful/sellable loot and will be pugging more.