Ah but in a single 4x1 space I can have the complete date (including day of week as well as the week number), the time, the weather, battery life, a vibrate switch, a wifi switch, and a bluetooth switch as one example. And single tapping or holding each of those respective things launches the various related apps: Calendar, alarm clock, weekly weather forecast, task manager, wifi and bluetooth menus (or just turn on and off). One of the four spots on my dock is a folder that has my 16 most popular contacts, just one tap and it calls or messages them depending on what I want it to do.
I still have another 4x3 left on the homescreen as well as 3 other dock icons.
Live tiles are nice, but they don't offer me anything close to this level of functionality and quick access.