The same realization struck me about my math foo when I was taking algebra through calculus. I was always hit with, "Oh! I see. That makes perfect sense!" about 2-3 years after I had actually taken the course. (Mind you, I would muscle my way through the courses at the time, but the information didn't really make intuitive sense until the 2-3 year waiting period was up.)
So...perhaps I've reached the end of the religious text waiting period, then.