I used to have one, very handy for shopping and picnics; Great for moving kids around, little kids especially love playing in them with their toys on the move.Some cities with a hot climate managed to bring back the daily usage of bikes, by building a very good infrastructure. The first example is Zaragoza. In Italy also there are some cities as Bologna have a high daily usage of bikes even if the infrastructure is not that great yet.
Have anyone ever used a cargo bike (bakfiets) ? What do you thing about them ?