My thing is that what if I want delivery from some place in my neighborhood, but it's more than a few blocks away? (i.e. if I live in the West 60s but there's a place I want food from in the West 80s). 20 blocks each way is a bit far to pick-up food since it may not even be hot when you get it back. Whereas 20 blocks straight down a bike should be pretty quick and easy.

Agreed though that this doesn't mean delivery workers should ride bikes like maniacs. I hate how they go through red lights and go the wrong way.