We're about the same vintage and have often used a low tech solution: one person stands amidships holding a line that has one end connected to a centre cleat (or stanchion base or toerail). The line goes out under the guard rails and up to the deck hand, who holds the rest of the line. At a suitable moment the deck hand flicks a loop of line around the pontoon cleat and pulls the free end to hold the boat against the pontoon. The deck hand then waits patiently while the skipper faffs around switching everything off and getting other lines ashore, etc.