I am in the middle of building a Case Management system, and in this case I have an area where Managers can easily click to see a list of all of the outstanding work items for a particular document are contained in various doc type folders. Example folder structure:
--Member Services
----Overview of Work Items by Doc Type
------New Member Applications
------Beneficiary Updates
------Retirement Packets
My workflow routes shortcuts to outstanding documents that need working, within each of the document type folders listed above (and many more). Columns within those folders will be set up such that a user sees useful metadata about each "Work Item." However, it would also be nice, if you are in the "Overview of Work Items by Doc Type" folder, if there were a column that would proactively tell you exactly how many work items are in each of the subfolders. This let's a manager quickly see where bottlenecks are occurring for various Work Item / Document Types.