I use the jacklines when offshore, especially at night, and in any kind of heavy weather. Inshore and in calm weather I usually don't bother, though the safety police would disapprove. The jacklines are connected to forward cleats and to a pair heavy duty U bolts aft designed for running backstays (that I don't use).
I also installed two U bolts in the forward end of the cockpit that can be reached from the companionway so someone can clip in while still mostly below. That is one of the most vulnerable times, as you are sleepily coming on deck, no night vision, no feel for the weather, no sea legs yet. A number of years ago someone was lost on the Bermuda race while still in the companionway.
Sitting in a locker, waiting for spring work are two more big U bolts I intend to install this coming spring for the helmsman to clip into. I think that will be safer and better than hooking into the pushpin as I have been doing. Four dedicated U bolts in the cockpit should handle the on watch.
I also have quick releases on the tethers as pointed above in a previous post.