No, you should be fine. We live in metrowest, and have had a 2015 Leaf S for 2 1/2 years, and the absolute worst winter range has been about 60 miles. The heated seats are great, and so it the heated steering wheel. And the side mirrors are heated when you turn on the rear defroster.
You only need to use the heater when you have to run the defroster.
I read this as you saying that you consider user of the cabin heater as optional, except to defrost. If that is true, then your range in Winter won't apply to another Leaf S driver who actually likes to stay warm. My 2013's range, when new, in Frigid weather, was about 50-55 miles, depending on speed and how much heat I used. That was likely with some degradation (2013 was a HOT Summer here), but not any more than a 2015 would be likely to have now. I wouldn't recommend an S to anyone in the Northeast who had to drive it more than 40 miles, because that high heater drain is always there, not just during the occasional frigid spell.