The 'classic' desktop is not going anywhere its going to be with us for a long time.
If you dislike the metro interface you don't have to use it; just think of it as a visual start menu. You can remove all metro apps from it and just add normal desktop app icons. Searching for apps is faster and better than using the start menu; press your windows key and start typing and it will dynamically start finding what you are after.
Process of getting to the desktop from boot.
Login -> Press the desktop tile...
Tablets and the metro interface = the future of general purpose computing (along with iOS, Android). With MS/W8 you get the best of both worlds. Dock your tablet and you get the power of a full desktop, undock it and you have a killer tablet. No one is saying that complex apps are going to be immediately touch friendly, its going to require a whole new paradigm of UI and clever thinking. Also this is metro v1.0 the very first interation there is still a long way to go.
I've been running RTM since it was uploaded to MSDN and I'm developer when I have the 'classic' desktop open and am working I rarely ever see metro.