Don’t switch out to rollers. The best thing that ever happened to my launching and loading efficiency was a bunk trailer. If you have your bunks correctly positioned, it is nearly impossible to load a boat crooked. As far as launching, I back in to the exact depth I know will just barely begin to float the boat. From here the steps are different depending on how busy it is:
If nobody is waiting, I climb onto the bow while pushing off simultaneously, and the boat drifts backwards slowly. I have two little short ropes tied to boat cleats with a loop in the other end. I reach those over the dock cleats as I’m getting out and walk away to park the truck. I’d say this process takes me ~40 seconds once I begin backing up.
If there are other boats coming to launch I do the same first steps, but strategically back in much further away from the dock. Once I’m drifting backwards I either fire up and beach the boat if there’s sand (and have a keel guard), or I pull into one of the few open courtesy slips at my usual river launch just 10-15 yards away. This step probably adds ~30 extra seconds.
***I do not run Talons and have also seen where the spot lock plan backfired on a guy with his boat colliding into side of the dock as the motor tried to self correct in the wind***