I looked at the 13" and it looked just like a MacBook from the top except it's thinner, so that immediately didn't work for me.
I had exactly the same feeling.
I wouldn't swap my 13" white macbook for a 13" MBA. The 11" is sexy, it's something new and entirely different, not as much as the iPad but a bit like it on an emotional level. The 13" MBA is a beautiful evolution but no revolution. It's reasonable and rational and I could never love it.