Unused column cleanup assistant

Continuing the discussion from Cleaning up your unused columns:

Hi all,
Moving this to a Feature Request.
I would like to assume I’m not the only one cluttering his sheets/tables with columns that end up unused. Wouldn’t it be great to have a process to clean these up?
I’ve offered one implementation option in the post referred to above, but I’m sure our Glide friends (@david / @Mark) can find a more elegant way to do this.