I also agree with the idea and think this is essential. I've been working with AC for over 10 years and the GUI is really outdated. People keep asking to update the interface for years...
I don't think that AC needs to be like Revit or Max or Photoshop or any other program for that matter. BUT - AC might adapt some cool features and new ideas, that others are using for quite some time now. Context menus, pie menus, conditional layer filters (and not only layer), etc., etc....
MAC interface, to compare to Windows interface is far far behind. I know as I work on both platforms for a long time and I see the changes. Drawing windows keep hiding under menus, bla-bla-bla - a lot is written about UI. One moment in particular is annoying, when one publishes something and while publisher is doing it's magic, one jumps to another program / desktop / etc. When you switch back to AC, the publisher window often gets under, for example, Organizer window. You cannot close the Organizer window, as the publisher is active - but you can not reach the bloody f...er as it is behind the other one....
Long story short, GUI should be changed / updated PRONTO, as all the competitors are moving forward and one day they'll get too far ahead to catch-up.