I find it interesting that average consumers who have this machine don't seem to have any problems with the keyboard (and even like it) yet a lot of the reviews and the Jason Snell's and Marco Arment's of the world hate it. It just tells me most reviews of this machine were pointless. To me reviewing a product for what it's not rather than what it is, is not a proper review.
There is a noticeable difference. I can see how someone who writes for a living can take issue with the keyboard. It isn't as "spongy" as a normal keyboard, and if you are used to typing with lots of pressure I can see how it can be uncomfortable. The key to me seems to be type with as light a pressure as possible. If a keyboard cover ever comes out for the MacBook, it might make Snell and Arment feel a bit different about it, though they would not be able to close the lid with the cover on it. Just for kicks I took the cover from my rMBP, and while it does not perfectly align, I can tell the difference already. Of course, as heat-sensitive this device is, I doubt we'll ever see an official cover for it.