Yes, walking does feel good. Boring, but good for ya in a number of ways I suspect.
Question for you back experts: one thing I notice I do is cross one leg over the other when I sit in most chairs. When I try not to do this, I soon find myself crossing the leg again. Even if I'm in a slightly reclined lounge chair with my laptop on my lap for an hour or so at a time, I still have a leg crossed. Somehow just feels more comfortable to me that way.
Could this be aggravating the problem?