Whilst I know how cool it is plugging a cable into the side of the boat, I have long ago taken to having my shore power cable as just an extension with a socket wired up inside the boat. The socket on deck has been redundant ever since.
That way the connection to my systems is always dry and the only (very) mild irritation is a cable hanging down alongside the companionway.
And like SD, I wrap the shore end around the post on the dock and I also have a tie taped onto the cable that I fasten to my anchor winch with an appropriately long loop (6 inches longer than the dock line) between the boat and the dock.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke