I have one of each.  While I still enjoy shifting, I have gotten to where I prefer the Auto.  I always hated going up a big hill and running out of steam with the manual.  Sometimes shifting to the lower gear can get you into trouble.  In a case like that you just give the auto more throttle and away you go.  But then again, it might have something to do with the fact that my manual is a 250 and my auto is a 600, there is surely a difference in available "steam".