I have also experienced people who use cell phones in public places and who don't abuse it. However, I have been in plenty of situations where it is abused and annoying. A plane isn't like many other places where you can get up and move - and there are already inherent stresses to flying, including forced close proximity to others.
Count me in as someone who hopes to be dead before the use (and abuse) becomes widespread. I have a pretty important job and need to be in close contact most of the time, but I know the world will continue to rotate even if I'm unreachable for periods of time.