Steve,
We have quite a few guests and a lot of summer residents who make that drive and all seem to find it a relative breeze. To Michael's point, I do not know many who go up the 95, most go east at Bangor (which is more scenic and shorter in distance) and wind through Saint John, N.B. It is a prettier drive, shorter in distance and the exact same duration (according to Google Maps).
Best,
Ben