Personally I like the coloured interface, as it give Vectorworks more character than some other design applications, and can help usability. However, I also agree a fe different interface options might help solve this, but that seems like a lot of work, when there are more important things for focus on.
Jonathan Reeves is an award winning architect, author of Innovative Vectorworks BIM and professional Vectorworks & Twinmotion Partner specialising in Training Sales, 3D, and BIM.Websites: http://www.jra-vectorworks-cad.co.uk/