Having a full-time dockmaster or staff of dockmasters who can keep an eye on boats, especially in troubling weather.
The one I recall being impressive is Zahniser's in Solomons Island Md. I was there during a storm and the staff was out in the worst of it with flashlights and walkie talkies. It's anectdotal since I was just there for that one storm, but it is what you would like to see - marina staff braving the weather to check on boats.
Twenty years from now you will be more disappointed by the things y%^&*.....oh never mind. 90% of the people on sailing forums already use that as their signature! I'm not a conformist.