I don't miss, want or need the Start Menu. I will likely be one of those that disables it. The changes Microsoft made to the Start Screen fixed all my beefs I had with the original in 8.0. I'm now working on my fathers Windows 7 laptop and find the Start Menu cumbersome and frustrating. I wasn't expecting that as I liked and used Windows 7 for many years. It was and still is a great OS. It was weird how I could forget things I used to do every day so quick. It didn't last long but it made me chuckle in side while my father watched me struggle to find things.
If they make open Metro apps look more like running desktop programs that will work for me. Resizable windows instead of snap. The option to NOT auto hide the taskbar and the menu bar at the top would be nice too. The one thing I'd really like to see killed is the auto grouping of tiles on the Start menu. You should be able to use single columns if you want and leave empty spaces. Like you can with shortcuts on your desktop.