I have to disagree just a little here. For one thing, once the ThunderJets hit the north Oregon coast ramps, most of the marinas put signs up forbidding powering onto the trailer (or the back of the tow rig, as was too often the case!). Secondly, I really suck at hitting the middle!
I launched and retrieved my 22CD single handed 90% of the time, and do the same with the 25CD. To retrieve, I back the trailer deep enough to let me float the boat within 2' of the bow stop. Then I step up on the tongue, hook up the strap, and winch it home with very little effort. I usually have a dock next to the ramp I'm using, so I walk over to the side of the boat, put a hand towel folded four times between the side guide and the hull, and pull the boat tightly against it. If I have placed the trailer just right, the friction of the carpeted bunks holds the boat tight against the towel while I pull up the ramp. Done. Perfectly centered. B~C has even made some ingenious carpeted spacers to hang on the side guides. Me, I'm happy with the towel, which I don't even need to dry my feet because I have yet to get them wet.
Fred showed me with his 22CD how he doesn't even have to worry about centering it before pulling up the ramp. He knows just where to put his shoulder to scoot the rear of the hull over while sitting on dry land.
Les said something once to a gentleman who was reluctant to dip his trailer hubs in the water and preferred to use a power winch to drag the boat up. He said the wheel bearings cost 35 bucks every couple of years, but the little bitty eye on the bow is bolted through a $40,000 hull. Back it in and make it easy. To take that a little further, Bearing Buddies cost less than the bearings, and if they are properly used, the bearings will last even longer.