I've always been Horde as well. My highest level Alliance toon, up until a few weeks ago, was 12. A long time ago, I started a lock on another server, but I couldn't finish because I was just too busy with other toons. Since they now allow you to create toons on both sides of the same server, I started a team of Ally Druids. I was surprised at how much I felt like I was playing a different game. I don't know the quests, or where any of the NPC's are... i.e. the class trainers, flight masters, innkeepers...etc. The landscape is more lush and immersive.

I think the most refreshing thing was the maturity of the chats on the Alliance side of my server. Sure, there are always going to be a few trolls, but for the most part, the trade chat is used for trading, the guild chat is used for recruiting guild members... I mean, people were actually polite to each other. What a concept, huh?

Anyway, if you've always been Horde, I'd suggest switching it up and going Alliance. The only problem is you'll find yourself standing in the wrong place every now and then, and that can be deadly