I don't know I guess it is just up to personal preference. I love having that high of a resolution because it allows you to see more and keeps the game playable with windows such as maps, bags, etc open. Plus I am running a 6950 that can handle that kind of load. Once you try it at that resolution it is hard to go back eg. I occasionally play on my macbook pro (13) it is hard to get used to the "small" screen size.
Plus, while I am playing I usually have my laptop on my desk for email, web, and netflix.