i think it can be confusing to new users to have column mode accidentally activated. what are the things they will try to get out of it? maybe worth considering all the panic commands they'd try, and either deactivate or message what to do to deactivate?
if c-c c-c is being weighed, maybe consider it as one of those things to possibly tip the balance? i do not use column mode (drawers are slow, too disorrganized to make a contact list with it), so cannot say. some things they might try are: q, c-c c-c, c-c c-k, esc esc esc, c-g, undo, whatever they tried last, c-u on whatever they tried last, revert, kill buffer, ? as a speed command, look at mode line, skim the manual [for what?], c-z, whatever vim does, spacemacs?. similar for things like outline search view and org agenda restriction lock, but in my experience, those are less commonly accidentally activated.
