In fact, agreement is a sort of spam - it consumes space and usually doesn't bring new thoughts. When I imagine a typical conference where the participants are constantly running out of time, visualising the 5-minute question interval consumed by praise to the speaker helps me a lot in rationalising why the disagreement culture is necessary. Not that it would be the real reason why I would flee screaming out of the room, I would probably do even if the time wasn't a problem.

When I read the debates at e.g. daylightatheism.org I am often disgusted by how much agreement there is (and it is definitely not a Dark Side blog). So I think I am strongly immersed in the disagreement culture. But, all cultural prejudices aside, I will probably always find a discussion consisting of "you are brilliant" type statements extraordinarily boring.