Perception is also a big part of this debate. If I think it looks better (1080p) then that is what I will get. Personally I do see a difference and no I am not saying that to make people who own a 720p tv feel bad (whoever posted that was making a gross generalization).
As to the original article there are two problems. It is a SINGLE article and there are many on both sides of this debate so there goes the chance it is the singe definitive viewpoint. The second problem is it is CNET who used to be a reliable site and has been going downhill fast IMO.
As to the poster, hmm, you did some research huh? One article is research? Seriously? Research entails a lot more work and in the academic world online articles/blogs are laughed at when you use the word research in connection with them.