Thanks for the short and sweet reminder Dave
Something I do to keep myself sharp when riding is I practise riding around things like drain covers that are in the middle of the road. I do it to sort-of train myself & remind myself what to do if I come across a real obstacle on the road. I only do this when there is no traffic around and I keep the movement smooth and flowy.
I think if you're paying attention during a ride, most of your real obstacle avoidance should be smooth and flowy anyway. If you are having to make a sudden movement, it probably means you've been really unlucky (OMFG A DEER IN FULL SPRINT!), your speed was too high for the conditions, or you weren't paying enough attention.