I live near Lincoln Center, and the corner of 59th & 8th (northeast Columbus Circle) has exploded with pedicabs doing park tours over the past month. They are dangerous in CP because they are sharing the same southern route as the horse-drawn carriages, but unlike the carriages they tend to stop in the middle of the park drive so their passengers can take pictures. Outside of CP I haven't seen them be a major problem.
Most of the drivers seem to be European college students here for the summer, so I'm hoping that
come late August they all just go back to school. They're probably paying an arm and a leg for the "privilege" of riding someone else's cart & license. It's a very crappy summer job except for the fact that they get to be in NYC.