I fully agree, but some people are attracted to this space filling 'switched on' (it's not, I am thinking about something completely different and just generating random output with the speech center of my brain) peolple; it's some kind of a hack to be 'liked' and 'thought off as being a fast thinker'. I never use it with friends or colleagues. But it works very well in interviews, parties, social gatherings, VCs etc.