Depends on the hull
Posted by: Waterbird on Oct-01-12 2:12 PM (EST)
Once I learned to turn by leaning, I almost never used the rudder on my Old Town Cayuga 146, even in rough water. But my Eddyline Journey, just 6" longer, definitely benefits from the rudder. So length isn't the only factor.
BUT: It could be a pain to lean the entire day if the wind and current make that necessary. In that case I would definitely want a rudder.
But you're right in general that leaning is a good way to take pressure off the shoulder.