Forget the paperless society. It’s not here yet, and chances are you have documents and receipts you need to file. The purpose of filing is to be able to retrieve said document at a moment’s notice. File at least once a week (hint: If you do it every day, it takes 3 minutes or less).
Have a dedicated in-box ONLY for paperwork that needs to be filed. Make yourself a nice cuppa — or a glassa — and file away. I turn on the TV to make it more interesting, then spread all of the filing on a table or desk, put it in order and file.