The main effect of this is that I am simply uncertain of the identity of those I encounter. A simple change in context, like a change of hair color or meeting somebody in a different setting, is enough to render them anonymous to me. There have been some deeply shameful moments... the researcher in another department who went out of her way to engage with me, until I mistook her for somebody else for an entire elevator ride. The student I ran into downtown who was hurt because his prof couldn't recall basic details of his project - I literally did not know who he was on account of his bike helmet, despite having in him in class not even a day before. Once as a child I backed away in fear from the dinner table when a stranger took my father's seat. All he had done was remove his 1980's mustache.
99% of the time this condition is invisible even to me. A normal work routine ensures that I only meet people in the places I expect them. I would never, ever mistake my wife for a hat. But if she turned up in an unexpected place, I fear I would walk right past her. And if I meet new people in rapid succession, I have almost no hope of recall unless they have conspicuous features like jewelry, tattoos or expressive hair. Art receptions are generally a breeze. Tech conferences are the worst.
Assuming we ever get to work in close quarters again, try guessing at the identity of your co-workers from behind. Almost always you'll be positive whom you're looking at. But not every time. For most people, it would be enough for the subject to turn around and provide a clear view of their face. For those with face blindness, even that may not resolve the ambiguity. Now imagine repeating this exercise at the supermarket, where you cannot expect any particular person to be present, and you can get a sense of the anxiety this condition can cause.