I miss walking to work for those 20 minutes of reflection before and after my shift.
Now I ride motorcycles. That gives me hours to think.
I highly recommend it.
An unexpected side effect is a new small group of friends who don't give a shit about tech, but share an interest in sampling food from faraway restaurants and getting there using as few highways as possible.
Unfortunately, it also makes sunny days unbearable when you're stuck at the office. Never park your bike within sight of your desk.
I miss exactly what you're describing. It's amazing how much solo time on a bike clears my head!
That being said, sometimes I have 20 minute showers because the thinking session is just that good. I have drawn more than a few diagrams on the foggy shower door.