One thing that really impressed me with the 7 (that i didn't expect, since i thought it was just a "sales gimmick"), was the new haptic feedback feature. The reason i prefer Apple phones is simply because of the feel of the product, so other than the taptic engine, nothing really impressed me. It doesn't flex, but the aluminum feels a bit "hollow", and the screen doesn't have that "glas" feel that the 3g had (could just be false nostalgia though), so nothing new there.
Other than that, i havn't notice any differences yet other than the better screen/colors, speakers, and faster browsing. The "no jack" situation havn't bothered me yet, since i just leave the adapter on my IEMs or put it in my wallet.