As far as I know - standing desks help you burn more calories, which is why they're encouraged as an alternative to standing all day.
In my opinion and experience, I enjoyed it every now and then as a way to get away from my desk. As Ben mentioned above, some people enjoy changing their workspaces so their body isn't in the same position constantly. Experiment with it and find what works best for you. I've seen people use cheap Walmart/IKEA end tables on top of their desk to make a standing desk too. Obviously there's more expensive options, but unless you're using it full time probably doesn't make sense to invest in one.
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