Im thinking about upgrading my autopilot and using a furuno In "Sabiki mode" it sounds much better for holding position since there is no additional motor and it uses your existing stuff. We will see.
It is true that you will not have and deploy a electric motor,
however the Sabiki mode is half of the Spotlock/Virtual anchor system as it can not hold position, only direction and must shift in gear manually. If a electric motor is not a option then i would do it as i always did, manually by steering and shifting as the continuously shifting in and out of gear would drive me nuts and i don't think that this is very good for the lower unit.
A electric motor is a different beast, not only because they are very silent, also because hold the boat in position or allow extrem slow speed trolling, following a route, etc, and that makes a electric motor a total game changer for any kind of fishing where extreme slow speed or holding position is the key to success.
For just a half a hour fishing for pilchards or similar Sabiki mode or electric steering will work, but fits my believe that for many hours its not the best system.
Chris