I'm very, very bad at this sort of coming up with examples, so I don't think my inability to come up with any is much evidence for anything. I'm also very, very bad at finding physical objects amongst other objects, e.g. looking in the fridge for a certain jar.

FWIW, me too, on both counts. Though I don't classify myself so much as very bad at finding physical objects anymore, since I default to systematic search pretty quickly, and while it's slow, it almost always works. Interestingly, I noticed I can do it the 'normal' way when on Adderall - it feels almost like having a HUD that's highlighting relevant objects for me (very useful when driving a car).