I was seriously entertaining the idea of getting a top-end MBA earlier this year (refurbed for $200 off) but then the new MBP's came out and I couldn't justify a 13 inch screen and a Core 2 duo when for almost the same price I could have the 15 inch screen and a Sandy Bridge Core I7. I got the MBP and truly love it. I imagine the lightness of the air goes a long way towards what makes it so popular but I don't really travel that much, I just carry my MBP to coffee shops and tech events so it's not that big of a deal to me.
IMO the SSD is what puts the MBA over the MBP when deciding between the two. The big benefit is the battery life. The MBA is the first laptop I've ever seen where a programmer can work for what amounts to a full day on a single charge without any qualification.
I agree to a point. All of my regular-use apps (Eclipse, Xcode, Textmate, Chrome, Terminal, Echofon) all start up really quickly. I don't really ever find myself sitting around waiting for things on it.
