Eh - the defining thing of a new England accent is that they are non-rhotic. The Maine drawl isn't really out there. Other aspects of the accent - a few words are pronounced differently, but everyone has heard "aunt" versus "ant".

"There" might be "theh" in Boston and "theyeah" in Maine.

If you have an example of a ridiculously strong Maine accent id be curious. The strongest ones I've heard in person mostly sound like a combination of a slowly spoken Boston accent with a rural southern twang (more like Georgia than, say, Texas or Mississippi).

There's always some regional slang, of course. Nobody around here would ever be found whipping shitties, but tonic and bubblers might take some context for someone not from the region to figure out.