I can say I have experienced Brewfest from both sides, got as many achievements on the cow as I'm inclined to do. It's just not the same. I'd wager, however, that if you play horde like we play Alliance, you'd find Brewfest on the Alliance side as odd as we find it on the horde side.
For those interested, this is the video I made of the initial beer run on the horde side. This is the quest where you fetch 3 kegs. After you do this, you've opened up the daily. This is very confusing because the goblin tells you the guy with the kegs is on the road to Razor Hill and he's not. He's straight east of the Brewfest tents, in the area where a tower for the zeppelin used to be. I had to fail this the first time before I found the guy the second time.
Our last Brewfest event will be getting drunk and dancing in Dalaran. I plan on doing that on Sunday after the guild meeting. Of course you'll want to be there to laugh.