The often cited rule is that the hardest part of any task is starting. When you move to another work area you do so with a plan of what you are doing. So when you arrive at that workstation you start doing that work. And you’ve now just accomplished the “hardest” part of most tasks.
I haven’t tried out any sit/stand desks, but I have gone back and forth between having a standing and a sitting desk in my office. I’ve found that having only one option is suboptimal. As Lauren and I talk about our future home, one of the things I want in my office is multiple places to work, one standing and one sitting, so I can move back and forth as needed.