I should clarify, I was referring to the first visit to the site. So yes, I can see how this greatly reduces the vulnerability, though it doesn't completely remove it.

As an example, a rogue Apple Store employee could insert him self as a MITM between the access point and the internet connection. Anyone testing out a new laptop in the store (or logging in to their bank from a just-activated iphone) would be vulnerable, without the attacker ever having touched any of those devices.