I learned a lot of useful skills in the military, but 'walking with a sense of purpose' was definitely one of the best. In an office environment, it may only save you a matter of seconds per day, but it makes you LOOK like you're infinitely more productive.
I used to tuck a leather notebook under my arm as I goofed off, er, I mean, went about my business. It lent me great dignity. And then in the last few years before I retired, when cell phones were becoming ubiquitous, if I saw a 'suit' nearby, I would lean against a wall with a cell phone at my ear, talking earnestly. If said suit caught my eye I would give him a solemn nod as he passed.