As for courtesy, the author is lucky to work in a company where the CTO is not afraid of "hands-on" work. If I was asked nicely, I would be happy to help move the table. If I had a critical system I was trying to repair, I would ask nicely if I can assist in a few minutes.

As for being a full time furniture mover, no. I would put my foot down and say politely but firmly, "I have better things to do, hire a professional."