Not me, personally. But a well-known, Mac-enthusiast and journalist for the Chicago Sun Times, Andy Ihnatko recently switched from using an iPhone (since the original release) to a Galaxy SIII. Good points and very interesting article.
Ever since Android 4.1 and features like Google Now, I've been tempted to give the green robot another chance. Apple is genius at tying you into its ecosystem (the integration of iTunes, iCloud, etc., make switching seem unthinkable), but if this long time iPhone user can do it, maybe I can too.