Interesting, the way I think I think while walking/hiking is much less wrestling one specific topic to come to a conclusion and more bouncing around between many things. Maybe I don't even really conclude things but instead just move an idea along.
It's a sort of personal retrospective slash backlog grooming session.
We need that idle time. When I go on long motorcycle trips, I return with a clear head and a much better idea of what I want to do next.