Yes, the point is to realize that the comfort zone is a mental state, and not really an zone, as the name seems to indicate. In a way it is like personal space, wherever you are, it will accompany you. Only, of course, that the opposite usually happens, and we drag an discomfort zone wherever we go as long as we are not comfortable with ourselves.
All the examples you mention make me think that discomfort arises precisely when we don't know what to do. The answer for me is easy, if you don't know what to do, settle for doing nothing, and see everything else that you can do as an advantage.
I think it is very difficult, for the common people, to simply stand still and do nothing. From there can easily arise discomfort.
HaHa! It's actually funny to imagine someone dragging literally his space of discomfort with him! :D
best advice :)