I have a sit-stand desk, which is fairly common in Denmark. Last time I spoke to an ergonomicist, she said the most important things was to change position. Standing all day isn't great either.

I'm trying to start a habit of raising the desk before leaving for lunch, and before leaving at the end of the day.

I bought the Ikea sit-stand desk for home, since I find I waste less time at the computer if I don't sit in front of it.