Lets see the person who was first to level 85 didnt do it questing. And he did it my way a year after I posted on this forum about it:
http://www.dual-boxing.com/threads/19496-Tag-Boosting
http://www.youtube.com/watch?v=IcD5rQJONV4
"I only have to tag"
"Outside Mob Tagging"
Each level 83 mob gives about 1200 non rested exp (with group bonus) to a group of one 85 and four level 81 or roughly about 5000 exp total, not considering rested. Pulls of 20 mobs are simple and the spawn rate is well Im going to time it.
If you have some actual math or SS and not "DeathWalker should be level ... by now" to support the contention that there is a faster method then mob tagging (as long as you have enough out of group helpers so that you can kill the mobs really fast) lets see it.