As a super admin, it is sometimes challenging figuring out why one of my users cannot see something (or on occassion, why they can see something, when they shouldn't). I think most people have a "Testy McTestface" user, or some dud user which they can assign and remove permissions to and from, but some setting is always missed -> particular demographic, or location, or group.
Ideally, some temporary permission inheritance feature would be great.
Facebook has one:
sudo on Linux would be another example.
I'd envisage the feature only being available for super admins, as there's a whole bunch of other sensitivities to be considered if there were administrators who could see their own notes and they're not supposed to, etc.