We had the same problem in Annapolis during extreme winter tides. -only me actually; wife didn't come out to the boat during winter. However, it was only extreme a couple of times, where it was difficult to get in and out, especially with ice and snow around the boat and dock.
I'm 5'11", and it was a challenge. Just had to climb. Used winches and rails as steps. Not safe. Luckily only a couple times.
Then we moved back to Dana Point. Woohoo floating docks (pics).
Sorry no real answer, only a story