This prompts an interesting quantitative analysis -
Number of earned ski days this past season in the East that entailed skinning yet were not at closed ski areas (since they always have ascent routes gentle enough not to require ski crampons):
Number of days on which ski crampons were deployed:
2 (i.e., on one day, first skinned up to top of GoS Gully #3, then skinned up to Hillman’s just above the Y split, to where the narrow chute opens up in the steep broad snowfield; one other day, booted it up through Tucks, but then used ski crampons for traverse over to NE snowfields on way to summit)
Number of earned ski days out West:
Number of crampon deployments:
6 or 7
So, yeah, they occasionally come in handy out East, but out West, pretty much essential gear.