I would say if you never go into a marina, anywhere else with pontoons or a lock, you can manage quite well without reverse. But if you do go into any of those sorts of places, reverse is a god send. Spinning an outboard round just doesn't work for me. You push the stern to one side as you spin, so you have to over spin to compensate and then spin back to the middle, and by that time I have usually hit that which I was trying to avoid.
But I wish I had my gear lever on the front, as some outboards now do. Mine is down the side and practice as I might, I always have to look down to find it, just when I don't want to have to take my eye off the impending disaster developing in front of me...