I am going to be up in Maine soon for a business trip. I was told by a women with the Maine State Police that even though I do not have time to get a non-resident permit, I can openly carry without a license.
That suggests to me that there is some awareness within the law enforcement community.
By the way, the restriction on carrying in a car without a license is terrible! I am not terribly happy about the concept of parking, going to the trunk, putting on my holster and racking the slide. Then going back to the car and undoing those actions to keep the firearm in the trunk.