Your skill at the language does not make the language itself any less complex. I got a 5 on the AP test, but I still respect how outrageously difficult Spanish grammar can be. What Spanish are we talking about? Spanish 1 is a lot easier than Spanish 4.
T'was in Spanish 3, I'm now in Spanish 7/AP Spanish. Mostly we've just been practising for the AP Exam and going over grammar that we should have learned years ago. I think I'll just start a new language next year, I'm getting tired of Spanish.