It's quite funny I think:
Everyone's doing the first quest, when you have to read 3 parchments and listen to them, but 99% of the people are annoyed that they can't complete the mission, because there are 30+ people blocking the cultist and the quest item in Orgrimmar (Don't know about alliance, guess the same there). Note: This only works on the first 1-2 days of the event, at the middle of the day when the servers are crowded.
However, you can be smart and back out this problem, by using Lesser Invisibility Potion!
Most people don't know about this, so just go on your alchemyst character, or have a friend, and make a few of them (Only costs 1 Wild Steelbloom and 1 Fadeleaf, so should be cheap) And put it on AH!
What the potion does, is that it makes you invisible, BUT, you won't be able to see others, so you can finish the quest.
On my realm, there aren't any of these potions around, so I think you can dictate your own prices on your server, maybe buying the remaining reagents for the potion, from the AH, so you will be the only one who sells them.
Sorry for the rushed post, I don't have much time, but hope it can help a few of you!
Ps: If you want to target NPCs, you can use shift+V, but to interact with the object, you can't use that method. (And that's the point.)