As admin, I can get other people's dashboards using the /dashboards/admin endpoint. However, the information returned is limited: I can't get a .dash file or widget objects. I want to use my admin ...
DRay HamzaJ's solution works for the scenario I needed. But there might be other cases where I want to use my admin access; so it might be nice if every endpoint let me use adminAccess=true to circumvent permissions. For now, I've got what I need though.