I'm using a huge catch-all project's workboard to manage my tasks, but I only care about the 10–20 things I've actively pulled out of the "incoming" column and put as next-up. I've got a hidden "icebox" column with over a thousand triaged tasks, but there are hundreds of untriaged tasks in the default column which would be great to be hidden.
I imagine hiding the default column is disallowed for user confusion purposes, but in this case I know what I'm asking for. I think. :-)