Perhaps that'd be good for motor neurons. But walking on concrete paths lets your mind focus and think about new ideas without worrying about tripping on something unexpected
I also run a lot. And I do realize, my runs will be happier, if I don't constantly worry about pace. But can't help myself, not thinking about it. And all this despite being only a recreational runner.
I'm the opposite; when I do run (which isn't often, now) I would rather run on a treadmill and listen to a podcast, or just music and zone out, and not have to worry about dodging obstacles or not being able to time my run.
I do love riding my bike around new places, though. I guess that's the same thing.