I personally dislike it, as I find it difficult to track the bogie once its disappears over the nose (my fault, I fly the hog alot, and the big nose don't help matters)...however, I've tried turning enemy icons off once I've ID'd them, and it seems to help alittle, I think it has to do with 'tracking the icon', ie. once the icon disappears, your 'reference system' of visual contact is disrupted, and the eyes are fooled, thinking the bogie graphics of the plane have disappeared, which they have, under your nose...confusing? hehe, anyway, I, for one, dislike disappearing icons...
Opinions? Rants?