I think the first lesson needs to be learned by the marinas, not by boaters.
1)- width of the slips. If you dont have at least 3' clearance on each side you will end up against the pilings no matter what
2)- piling height on floating docks. We see this in every storm... With floating docks, if the pilings aren't high enough docks float free. Remember the images dorm ft Pierce back in 04? With fixed docks, if the pilings are too low, boats come back on the pilings or the rub rail gets caught on the way down causing damage that could have been avoided
I understand that taller pilings require deeper set and in deeper water it may be an issue but not in shallow water most marinas are built in
Here in south Florida I ve seen tall pilings being set and the cut off with a chain saw!
The best floating docks I ve seen were at an ICW marina in top sail NC. The pilings had steel tubes which could rise with the docks adding a few feet of protection.
I know nobody can prepare for really bad storm (over 120kts) but with sandy the winds were manageable. The surge was obviously amplified by shape of the coast line but all the tide gauges in the area only indicated a surge of 8 to 9'. Obviously the timing was terrible since it came at a full moon high tide but it is still not a catastrophic number. I hope that marinas learn the lessons.
As to boaters, one thing that s often overlooked is line placement on the pilings. Everybody talks about line size, charging protection, etc but line placement is critical. If you set your lines at normal tide and place them near cleat height on the pilings, by the time you add 8' they will be very tight. On the other hand if you put them 4' higher, they will be at the same angle by the time the water level is 8' higher
Finally, use fender boards. I wonder how many boats relied on fenders alone whereas fender boards who have prevented damage. To play it safe and avoid the board being moved by the wind, use oversized heavy wood and tie the board to the top and bottom of the fenders
But as we have seen time after time, prep is 50%, the rest is luck!! Look at Robyn Nest picture with that carver hanging behind it... On the Hatt forum, there is a guy with 43 which was docked 2 slips from where Current Sea ended up. He also had a carver leaning against is boat. In both case it's very possible that AHs the surge lasted a few more minutes both boats would have sustained severe damage... Who knows.