The ability to toggle visibility of hidden columns when editing schedules would be very helpful.
As it is, all of the hidden columns have to be unhidden before being able to update one column, then each individual column has to be hidden again.
Upvoted for the Toggle option.
However, (from memory, don't have Revit open right now) you should know you can edit the Formatting (?) of a schedule, select the parameter and toggle whether it's hidden or not, without unhiding all parameters (columns) wholesale.