Physically separated on-street lanes are great until you get to the intersections, then they are far more dangerous than just riding in the street. This is especially true when the separation is a parking lane, because then you become invisible.
In NYC they repaved 1st and 2nd Avenues, both have parked car separated lanes. On 1st Avenue they changed the left turns from a left turning lane at the end of the parked cars, to one where the car should proceed to the intersection in the driving lane and then turn 90 degrees. Guess what happens? They turn perpendicular to the bikes and just go through. At least while they were parallel you could go around on the right side (of a left turning car), plus they are parallel to the bikes where they can see them. Its a disaster waiting to happen. This new idea is supposed to be an improvement but I don't think anybody really thought this out, or really rides a bike either.