I've always been an avid Gnome user, but now with the 3.x version, and distros dropping support for 2, I'm thinking about changing to a different desktop environment. I'd like to know why you like the environment you're using. Please, keep it simple and no arguing with others (unless they say something illogical or incorrect). Advantages/disadvantages are a plus.
TL;DR Tell me why you like your desktop environment.