For me, it's not at all "I'm incapable of explaining this to you given a few minutes to collect my thoughts." and very much "You either get Coding Mode, or you get Conversation Mode, but not only do you never get both at the same time, I need time to context switch from one to the other.".
And I've been programming professionally for quite a long while now, so this quirk of mine doesn't seem to have made it difficult for me to work at programming shops.
As I've gotten older I've discovered that I really can't judge normalcy based on what I find natural to me. Every brain is different and abilities range. Some people visualize things in their head; some people have to talk out their thoughts; some people are more optimistic. If we are only grading on one very particular brain type then we are missing out on the opportunities for diverse thought patterns producing something even better than expected.
