I can totally relate and to this day I describe one of my greatest failures as a manager as analogous to how "easy" math was to me. Until Calc II I really found nothing about math challenging at all. The result of this was that everyone wanted me to tutor them in math. The problem was that I didn't solve math problems like other people did, in fact I had no idea how I did what I did. I just did it. As a result when I tried to teach someone else it was an unmitigated disaster.

Fast forward to the real world, one of my biggest challenges is helping people figure out how to get from A-Z. A is obvious to me. Z is obvious to me (although I'm probably wrong as much as I'm right), but getting someone to understand my reasoning is almost impossible.