bar harbor after the 'season' is worth a trip.
We like Bar Harbor any season. Logistically the summer can be challenging but if you stay at any of the campgrounds along Rt. 3 you can take the shuttle into town so you don't have to deal with parking. Eat at non-peak times if you eat out or make a reservation. IMHO the crowds are just part of the vibe that makes it so much fun. The down side is Acadia gets VERY crowded and that can make for a miserable experience. Mid-week is better than weekends and if you can travel in the off-season it is better but some things do shut down. The season up there is getting longer, though-many places are starting to stay open through October.
Maybe because we had spent so much time in Nova Scotia, and New Brunswick, that Maine just seemed kind of a let down.
The Bay of Fundy is a phenomenal place. I highly recommend it to anyone. I've never felt "let down" returning to Maine possibly because it's been a "go to" place for us for years for weekends, vacations and day trips. A lot of "let down" is based on expectations that aren't met. We go and know exactly what to expect and often are met with unexpected surprises. I love Nova Scotia and PEI but find both of them can be a little bit boring. The scenery is beautiful but after a while it's just scenery.