The main problem to me is that you do not always know if you are going to wait for 1 minute or 10. That can be very annoying. On good sessions though the back and forth is relatively stable, but too short to really invest your brain in something else and too slow to just stare at your screen.
And context switching is tiring, so if I can I write specs for the next prompt / next task, otherwise I just surf the web. You can also review the code as it is edited to save time.
