Unrestricted access to information! It would be like seeing the metadata of the world. So, if I wanted to know something about someone, I could just look at him/her for a second and have his likes, dislikes, family history, aspirations, fears and anything else I could possible want to know neatly displayed in a mental interface I could navigate at will. It would also apply to objects, so I could know how, why and by whom something was made.

Knowledge is the greatest superpower!