I'm still not clear what the objections are, judging by the posts here. The 2 main complaints seem to be volume or content. Either of which could be applicable to 2 passengers sitting next to you having a face to face conversation.
As for people using laptops or blackberry at breakfast, fair enough if it's in your company, although even then, in certain circumstances, say business trips, it might be unavoidable. But if someone else doing it annoys you, I sugget you need to get out of the other side of bed in the mornings!
Technical issues are another matter, but they've hardly been touched on yet in the thread.
I wonder if the internet had been available 100 years ago, would be we reading a thread about how intrusive Mr Graham-Bell's invention was going to be?