What rhino commands do you use on a regular basis and think others don't know about?

That functionality was introduced in Rhino 8. For users of Rhino 7 and earlier versions, there is a plug-in that does the same job. It’s the latest plug-in from the 1st post here (Editable curve on surface):

Editable curve on surface:
rhino6curveonsurface.rhp (166 KB)
! _CurveOnSurface
! _CurveOnSurfacePtOn

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