About a month and a half ago, Blizzard released a patch for World of Warcraft that allowed players with characters over level 55 to create a level 55 Death Knight on any realm. So, I had an 80 Alliance Night Elf warrior on a PvE server, and it wasn't on the same server as my friend's, and my guild on my current server at the time was really bad at raiding, and they were somewhat selfish drama queens.
So I went and joined my friend and created a Death Knight on his server. Except, it was a complete turnaround in terms of gameplay, for I was going to be playing on a PvP server as Horde. I was scared and reluctant at first, but now I have to say that I have never been more addicted to this game.
My friend's guild is fucking awesome at raiding, and the other night I got my first taste of the new 25-man Naxxaramas, and I was absolutely in awe what I had been missing out in this game. I started playing World of Warcraft about 2 years ago to this very day, and it's so amazing that the term "you can't teach an old dog new tricks" is absolutely rubbish!
So if you play WoW as alliance on a PvE server, I recommend flipping it around and trying Horde on a PvP server. You'll also find that a lot less idiots (AKA Children) play on the Horde side. In fact, I think Blizzard made the game so that the Alliance population would be dominated by people under 18, and the Horde would consist of a much more mature population.
I also have to say this too. If you don't play the game yet, then please, don't get into it. It will fucking ruin your life! I tried quitting 2 months ago, and a week later, I found myself back in Azeroth fighting scourge and other foul monsters...it's THAT addictive.