The potential wealth of information behind issue links often goes under-appreciated. Walk the tree of linked issues and visualise the map of dependencies, as well as the colour coded heat-map of what is done or not
Read FAQ for the quick start guide.
This feature is also embedded in Neelix Epic/Story Manager, Robo Analytics and the Approach grid. The process for building the diagram can walk the tree to the depth you specify. Nodes are colour coded to show their status. Tooltips display more information about the summary and actual status. Each node can be clicked to open the issue in the standard Jira screen.