After reading Marin's post I went back to the Original Poster;s and re-read it. This thread has morphed quite a bit, but the point that has emerged is well put by Marin. We need only to know what our boats will do when we are presented with a difficult maneuver. Practice, practice, practice. Then they will indeed be child's play.
Someone mentioned Powell River. The Gov;t dock there is a good teaching ground. Narrow fairways no place to turn around, boats rafted 3 deep everywhere, and the wind, she does blow. On my sailboat (goes back a lot of years) I had to go out from one of the inner docks, stern first the whole way, in a vicious crosswind. Learned pretty fast how to make that boat go where I wanted it to go. That is the lesson we all have to learn. So avoid being caught in a tough spot, pick yourself a few good markers and practice tough maneuvers. Then when the tough spot catches you, you are ready for it.
When early in the use of a trawler with twins, I was approaching the dock at one of our Yacht club outstations, where all members are constantly told to get out there and help the incoming, so as to avoid any problems. Help wasn't what I needed, so I had to wave off more than one "helper", telling them I needed to practice. It wasn't long before I could actually approach tough docking challenges and know I was up to it.
OP: Cameras might be a nice addition, but when the tough situation arises, nothing beats a direct view. I have cameras (x3) to show me what is going on back there, on my 44' motorhome. In a tough backing situation, I don't use them, as getting out and visually assessing the situation is so much better. I don't see how it would be better on my boat, as there I can easily leave my seat and walk to a better vantage point. I can see having a view to the stern to monitor how the dinghy towing behind is handling the seas, but for assistance in docking, I doubt their usefulness.