I'm not particularly proud of this trick because I'm not sure about the overhead of using the event "Drupal is initializing," but I wanted to hide a particular entire view display that could be accessed from the breadcrumb from ordinary users. I believe this is a taxonomy display maybe. But it works well. The view I'm trying to avoid is a view that subs "all" for the particular user ID.
What this use of RULES illustrates is how to use a path as a condition.