I also believe walking is underrated as a diabetes BG control tactic. I've used it as my main exercise activity for the last five years. It's especially useful when I see a post meal CGM line trending higher than I'd like. I can simply take my dog out for a walk and chop off the impending CGM mountain-top.
I don't speed walk, either. A three to four mile-per-hour rate works well for me. I live in an area with lots of gently sloping terrain and walking uphill adds to the BG-dropping benefit. Walking when my insulin is peaking really does amp up the BG decline.
Like Adam Brown says in the linked article, you may walk wherever you happen to be and it's free. I'm hooked on walking for exercise and BG control. If I don't walk for a few days, I see my BG performance erode. It's a gentle reminder that I simply need to get out the door and enjoy a walk.