It seems to me like we've covered this before, but I can't find it, so it must have been a while. The standard camera distance in World of Warcraft isn't bad, especially if your computer is right at the system requirements-- you can usually see most of what's happening and yet it's close enough to keep you focused on your character.
But if you've got a really nice PC and, like me, want to see a little farther than normal (or as in the picture above, a lot farther than normal), there are a few easy ways to increase your camera distance, as Dr. Laxative found over on LJ.
ImprovedCamera is probably the easiest-- it's an addon that will give you a slider to increase camera distance up to the max allowed range. You can also see, in the description on that site, that there are ways to edit your WoW files and increase the max range even farther. By editing the "SET cameraDistanceD" number in your config.wtf file, you can change one of the preset lengths for the camera, and then cycle through them with Home and End. You don't even really need an addon to tweak your settings-- type "/script SetCVar("cameraDistanceMax",30)" (or whatever distance you want) into the chat console, and then you should be able to scroll out to the max distance that you just set.
If your computer's not that great, doing this stuff will definitely introduce slowdown and pop-in to your graphics, so run these commands with care. But if you've got the gear for it, you can see Azeroth at a whole new distance.