Hey, Vectorworks gods:
1. World and local coordinates in both cartesian and polar units with the tape measure tool. Just reporting cartesian units is severely limiting.
2. World, local and polar coordinate entry options in offset dialogs (array duplicate, offset tool, etc.).
3. Radians. Useful for subdividing curves.
4. Reporting circumferential arc lenths in linear dimensions and radians, not just sweep in degrees or d-m-s.
My benchmark for these is the Form-Z interface.