In our games, Lawful neutral is often a strong (I was gonna say vibrant, but that's not right for LN) force in the world. Its a "strong government" type of loyalist or nationalist that are often the driving force behind nations in our games. The byword is often "right or wrong, our country". Definitely not Lawful Good or Evil, but Unaligned doesn't really cover it either.
I also feel there is quite a strong distinction between Neutral Good (velvet gloves) and Chaotic Good (do what thou wilt), tough this is a bit harder to put into examples. And Chaotic Neutral is to me a pretty good classification of libertarian capitalism. I don't feel any of these are redundant.
But in 4E, all of this doesn't matter. I feel the 4E alignment handles are insufficient for describing alignment, but I am relieved it no longer matters. In 3E, you were sometimes punished for picking an alignment, where a Neutral character could escape consequences, and that was a price of role-playing and heroism I definitely did not like. Thus I still prefer the wishy-washy 4E system to the game-effect 3E system. If I like I can use the 3E names of the alignments (in fact, I do so), and everyone around here will still know what I'm talking about, but there is no game effect.
PS: When classifying the alignment of Corellon, Chaotic Good became Unaligned. The way Corellon is described in 4E, he still seems to be what 3E called CG, only that alignment does not exist anymore. But they did not make him Good. It seems they use a different alignment map than you, Jhaelen.
~DS.