Dock lines vs. docking
At least for us, lines on the dock are more about getting the boat tied up than about the docking process. Docking requires a spring line to a midship cleat. There is no, "coming in a little too fast and stopping the boat with a spring line" for us. I would never rely on a cleat to stop the vessel. The spring line is for holding the vessel against the dock while getting the stern and bow lines attached. The premeasured dock lines allow attaching all the dock lines without having to adjust each one each time - a process that can take 30 minutes for us, or longer of it is blowing. They all have to be adjusted so that they all flex at the same time. Otherwise, if one is tighter than the others, a good solid rock will simply pop the cleat right out of the dock. If you do it just right (er, wrong...), you can unzip the cleats like a zipper! So, it is huge to have premeasured dock lines all in place. However, flipping them across the dock when you embark, instead of laying them along the edge of the dock is, well, just bad form...