Possible solutions: nerf dungeon experience unless there are five people in the group. Drastically nerf experience if there's a high level character along. More importantly, fix the pacing of outdoor content so that people won't get frustrated and turn to cheesy methods like this -- even hardcore, Mythic-raiding, altaholic Day-1 Warcraft players like myself.
I made one for my guildies but its for the Horde leveling process. One tip that goes for both factions is that you dont need to do all 3 zones to hit 120. I did like 1 and than three quarters of another. But once your 120 you need friendly with all 3 of your factions new reps to unlock world quests so make sure you hit at least friendly with all 3 while your leveling.
My toon was a monk, a class that gets extra experience for an hour at a time. I picked at it more than I have in the past, so I benefitted more from the 150 percent "rested" experience bonus. If I wanted to run a dungeon for quests, I fired up a high-level character on a second account and dragged my little toon through them. And having leveled dozens of characters to 100 and 110, I knew every zone and every objective.
Like most of those experienced players, I had all the benefits, including a full set of heirloom armor, which helps to boost the experience my character would get (though that bump was reduced at the same time the other changes were made.) I had a guild, the ability to fly in every zone, and pets and toys that made a pile of things more convenient. My new character started at level 20, as all allied races do.
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