Well, putting aside the endless war between cars and bikes... Several of my friends who bike regularly (hasn't happened to me, thankfully) have been hit by cars while biking, even though they were following the law and had all manner of blinky lights on their person.
I think that while the biking culture in Boston is great, it won't be a good replacement for cars until there are more bike lanes and more careful drivers.
Copenhagen has curbed lanes dedicated to bikes and the people take full advantage. I saw several Christiana Bikes on the road while there (In fact one lady used one to drag back a loveseat sofa!)
I think that while the biking culture in Boston is great, it won't be a good replacement for cars until there are more bike lanes and more careful drivers.