Drafting chairs work well - though it adds to the cost of the 'desk'.

I never understood why everyone wants desks that raise an lower, instead of just using the drafting chairs thereby avoiding any raise/lower mechanism.

High chairs make a lot of people's legs go to sleep.

Only if there isn't a footrest at the proper height.

Simple explanation: I honestly never thought of it.

Alternately, you can sit down and take a break. The need for that will happen less as you get used to standing.

The height of the shelf is perfect for sitting. You can put a laptop/monitor on it and the keyboard below for some variety.

I don't particularly want to have to move my two monitors, and laptop, and keyboard and mouse, every time I get tired. :/

I just grabbed a stool we had in the office. Problem solved!