You can't fly there. The first time you go there is via a cinematic/cutscene where an NPC flies you into the zone similar to Hyjal (ie, a portal, but not player-usable).
But you can port in lower-level players with a warlock and two others. My guess is that if they nerf it, it will be that way (not allowing players under level X to be ported in) or by screwing around with respawns or experience gain. But if you look around, there seem to be plenty of places where you can grind quickly. I think that in part because the quest progression forces players down a specific path, Blizzard has allowed the respawn rate to remain pretty high. I get insta-respawns in zones even when there are only two or three other people questing. It's annoying as a solo player, but multi-boxers get the benefit of almost constant spawns.
It still doesn't make collection quests enjoyable, but it makes them a bit faster sometimes.
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