Hi Paul:
For me, I have found I continue to mature as a teacher as the years of challenging myself and my students has grown. As I have become more confident in both my content area, I feel more able to try new techniques to assist my students learn.
It takes a bit of courage to deviate from what we know works, but it can be worth it if students benefit (believe me, not everything has been a rousing success - I think that why they call it experience).
Regards, Barry