I'm with JimEli on this - using NVG on crappy night to get the required visual references at the end of an instrument approach can make the difference between getting in and not and means there is no faff reverting to NVG flight in that transition from IFR to VFR.
I always flew with my goggles set up so I could look through them or look under them at the instruments - night coastal searches in crap weather often meant going in an out of scuddy cloud and then back to visual - very disorientating in the dark but being able to gain visual references quickly made a huge difference.