Org is wall-to-wall, especially in the main part of town. I want to see someone try to do some stuff like in the Trade District in Stormwind, its even more packed whenever I'm on. That'd be stuff hard and it'd take a lot of people. I think attacking Org would be a little easier because there's not quite so many people, or so it seems. I would also never want a huge mount. I wonder why 85s just sit in front of the auction house on their massive mounts for hours on end. If Hoarde attacked Stormwind, too, they have a long way to the castle to get the king. They could always come in from the harbor, though, I suppose, that way you miss the Trade District and just have to go through the cbrown towns. I see another problem being people who die just running back to their corpses and fighting again. I guess you could get in, kill some people, kill the King and work your way back out. I'm sure a lot of people would get pissy and annoyed anyway and just leave. :P
Anyway. I also discovered yesterday selling items in bulks of 20 sell hella fast. I put up a 20 of wool cloth and that sold literally in three minutes, then three sets of 20 copper bars for 2g 50s (50s less than the next highest set) and all three were bought out by the same person within five minutes. Never would have done this had my dad not looked in Org for some and saw people were setting buyouts for 20 copper bars for like 15g or 20g, so ridiculous.
So yeah. Long post. :D