I would like to dump on the stink potters as much as the next guy, but I have a bow thruster on my 54' sailboat. You're not backing it into a slip with more than a 10kt crosswind and my neighbor 4ft to leeward without one.
A friend has become convinced that to motor his 49ft sailboat to stern, the best method is to center the rudder and use the bowthruster to steer. At first, I sort of rolled my eyes. But I really don't know why that is much different than having a diesel/propeller in the first place.