On our first trip to/thru NE, I was worrying about Rt 2 from Maine thru NH & VT, I was all over the forums with questions, even did the street view of the entire route on Google maps, after doing the trip I realized that all my anguish was for nothing, US 2 is a great scenic route, not an interstate, but after you do the trip, you'll realize that you're thankful it's not.
You may get there faster on another route, but I think you'll enjoy it more on Rt 2.
2007 Forester 2941DS
2014 Ford Focus
Zamboni, Long Haired Mini Dachshund