Um, Illidan has a nice big queue, remember? That means that noone new is coming on the server, remember? So that means that Durotar is abandoned except for miners and people traveling between Orgrimmar and the zeplin. When you go to Durotar to mine, you want to get your copper and get back where all your friends are ASAP. If you're catching a zeplin, you don't want to miss it. If you had actually gone into Orgrimmar propper, I'm sure you could have found the beatdown you were seeking.