I don't know about the "cordial motorists"... But yes, the roads are nice, and if you like bike lanes you'll be happy. The best thing though is the number of cyclists. When there's a presence like that, it makes things easier for everyone.

P.S. I would like to say that my favorite bike lane is the one on Mass. Ave through Central Sq. I'm not a real bike lane enthusiast, but I love the way it merges into the center of the road, to the left of the right hand lane. If only more bike lanes did that... (Though for all I know such a thing could be common in other places.)