Frankly, elastic ties for halyards are a waste. As soon as the wind rises another 5 knots, they stretch and the halyard slaps again. Many slapping lines were (poorly) secured with elastic line. Three feet of line is better.
Yup. Regular line tied around the shrouds kept my halyards quiet in 40 kts one night.
I retied lines, added lines, and retied fenders to many boats that night. I found one pontoon boat tied with only two lines made of ski rope. Hmmmm. Funny thing was, he had other lines right on deck. I picked them up and tied them.
The next morning, I walked the docks and saw that all the boats were safe. There was satisfaction in helping to keep the boats safe through the storm. I gathered my own lines from boats to which I had lent them. Didn't get a lot of sleep that night, but it was a good experience. The next morning, I got to see a mink steal food from a cooler left onboard the pontoon boat. He left a little poop too.
I hope someone would do the same for me. Not the stealing food or poop part.