Ever since the increase in difficulty with walljumping, I've had a hard time finding a way on top of Orgrimmar. The reason being, I'm not an Engineer. (So no Rocket Boots, etc.)
About a month ago, me and a friend figured out a way to get on top with only these requirements:
---:::Necessary Requirements:::---
1x Warlock OR Hunter
1x Class with Charge/ShadowStep/FeralCharge, etc
NOTE: Using this method, you can only reach the top if you are one of the classes with Charge/ShadowStep/FeralCharge, etc
IMPORTANT!: You CAN bring up ANY class, but this would require Engineering, and the Mind Control cap. I'm not going to go into explaining the procedure for this, but it's not very difficult.
On with the guide:
At this point you're on top. There's a few different paths you can take from here. I'm not going to post them here because they have nothing to do with this post.
NOTE: The majority of this guide is nothing new, it's only the part with the Warlock/Hunter pet. The rest is here for your convenience.