The main advantage of the Tree Renderer is that it is able to show all nodes of Business Process trees at once. This works fine even for huge trees with lots of nodes. Please have a look at this screenshot to get an idea of how the tree view looks like:
Clicking Business Process Nodes collapses or unfolds them, clicking single hosts or services show the related monitored object. You can of course always switch back to the Tile Renderer with a single click at any time.