Much of that discussion is crap. They're wasting effort bikeshedding about local network sniffing. You have to assume that anything of value sent over the internet might be sniffed or at least could be sniffed by a well placed attacker. The last hop connection between your PC and the AP is hardly the only point at which your data is vulnerable. To assume otherwise is foolhardy.

That's why I said that the only additional risks I can see of an public Wifi is local attacks directly against your machine such as someone port scanning your laptop to look for vulnerable service or open fileshares, etc.