I just discovered that even guests can see the "USERS" page that shows not only how much data each user is sucking up but also the other users' login names!
Not that I personally mind the graphs being available to everybody but I do not like non-admin users seeing other login IDs.
Some ideas (not knowing how difficult each one may be to implement):
1- Non-admins may see the graph but the only ID showing is their own
2- Eliminate the display names from the chart
3- Don't show the graphs to non-admins