Retired now but I have done my share of rain commuting. I never owned a car until I was in my 30s. Lived in Massachusetts, Michingan and around San Francisco Bay. All get 38-42" of rain/year. (Well, not all of Massachusetts' and Michigan's precipitation comes down wet, but that's another issue.)
I used different strategies at different times as my rides changed, clothing options changed and weather changed. (Needing to be at work, not having a car and not having access to public transportation forces onto become quite adoptable.) I figured out a lot of tricks. Comfortable feet in wet shoes? Easy. Put your bare foot in a produce bag. Then socks as usual. Then another produce bag and a thin pair of those old man's stretchy socks that come up really high to keep everything in place. Your socks will not see either outside water or sweat and will be clean and dry, ready for the ride home.
Ben