I have learned to make myself visible ('as far right as practicable' is pretty close to the center of most lanes), and to not take my right of way for granted in intersections, still need to scope out what car from each direction wants to left-hook me or run a light and cut me off. Cannot push a yellow unless I am extremely confident there is nobody trying to do so from another direction (has to be nobody close because if they are close and I am close I know I won't have enough time to judge if they are likely to have forgotten a turn signal or whatever).

I have learned to look for where drainage puts silt or mud or wet leaves on an otherwise apparently dry lane.

I remain optimistic about bike lanes and shoulders (contra my 1st point). I am coming to wonder if that is a mistake on my part.