I'll happily tout the benefits to me thank you very much!
My standing desk[1] has been a lifesaver in terms of minimizing my sciatica. I tried a few different (expensive) ergonomic chairs, but nothing has been as good for me as standing has.
Whether or not standing at a desk will make you live longer is irrelevant to me. As the other comments here confirm, for some of us the tangible benefits are obvious. Try it out for a few weeks and see how you make out.