From what I can tell everyone is going to have to use the Metro UI because it has replaced the Start menu as the built-in launcher. There is also a new menu on the right side of the screen that let's you access search and settings among other things. So even producers must use some of the Metro UI on a daily basis.

I predict we will see a number of utilities emerge in the next few months to emulate the Start menu or otherwise provide alternatives to the Metro UI for said tasks.