You must be new to supercharging. With Cornwall, Kingston and the charge at Good Hope open, travelling back and forth has never been easier!
Don't even own one yet. Had one overnight but found the S too big for me, so I'm waiting for the 3. My biggest problem with the Supercharger systems as I see it is the lack of profit incentive. Personally, with all MS owners getting free charging and the hordes of soon to be M3 owners getting it heavily discounted compared to gas there is the potential for the system to be overused. And since Tesla doesn't make money on the system their incentives to continue building more and getting them done fast is dependent on marketing purposes. I just fear the congestion horror stories you occasionally hear from California where the popular spots can be a nightmare.