I think there are a few different camps of people:
1) Those who could care less - probably the largest group of all
2) Those who are interested in the 7D Mark II and the 5D Mark III not because they plan on buying those, but because they are hoping to scoop up their predecessors on the cheap. Nothing like a new release to drop the price of the slightly older model.
3) Those on the bleeding edge who frequently turn over their equipment. I can't afford to be in this group, but understand the necessity very well for those who make their living off this gear. While to many folks, the difference is negligible, if the new features save you time getting the image or getting a better one, the result is either a better image, saved time or generally both.
The group that is generally the biggest screwed in terms of dilemmas is the second group... Jump on the latest bandwagon, or make do on the cheap with slightly older tech. For me this makes it a real tough set of choices. I am outgrowing my T2i and have been tempted to step up slightly to the 7D for better focusing and speed since I am starting to do sports. I covet the 5dmkII since I also shoot some fashion and the like, so for me it comes down to the 7D vs 5DmkII , perhaps the 7DMKII if the sensor really wows, or the other one to really complicate things... a ProSumer Full Frame (6D???)... Net result... I expect that in the next 12 months all of those options will be available or known, and the price difference will be all within $600 - $800 or so I think