I have two Elements that I have in $RT_HOME/local/html/Elements
which serve to expand the Quick Search sidebar to include ticket owners and the number of tickets in their queues. The list of Queues is editable and it seems to work well to keep a fairly quick view of the status of tickets that are owned.
These Elements work for me, but I haven't done any testing to see if they are really bullet proof for everyone. Feel free to use and adapt as you will.