But it depends on the area and Winter temperatures I suppose.
In UK occasionally you have about +5 or 0 C
In Greece or Croatia I will not winterize also.
But in Poland even in Center near Warsaw we have few weeks with -20 C or more ...
So I always get out batteries from boat to home, and keep boat under cover having some air flow under it.
And I use automatic winterize routine for Evinrude outboard.
Keep trailer on (not idea about English name - sorry)
And Engine in lower possible position.
I can not use boat in Winter because of ice on Lakes and Baltic Sea