I live in Manhattan and I find a bicycle to be a better choice for the majority of my trips than public transit (it's faster, too). I only use public transit for long trips or when I'm traveling with suitcases.
Bikes are simply better at point-to-point transportation (the same advantage that cars have), except that they don't take up a lot of space so it's actually a scalable solution to have everyone using them to get around even in a dense city; see Amsterdam as an example.
Bikes are simply better at point-to-point transportation (the same advantage that cars have), except that they don't take up a lot of space so it's actually a scalable solution to have everyone using them to get around even in a dense city; see Amsterdam as an example.