In summer 2019 we (tandem) toured/camped the circumference of NS except for Cape Breton. The secondary roads had enough traffic to be annoying and no shoulders. Many places were beautiful. The black flies are a factor at camp (understatement). Was this tour wonderful enough that we would repeat?.... Nope.
Not sure if you have done any of Route Verte in Quebec, especially along the St. Lawrence and Gaspe, but if not, that is much more bike friendly, and the food, wine, camping are great.