I think facing death is a major issue for our Losties. The plane crash was an interesting experience that they all survived. No doubt it changed their lives. Jacob has a way of doing that. I also think any time you have a loaded gun pointed at you it should give you pause to consider your fate. They sure do that a lot in this show and really don't practice very good gun safety at all. I'm still waiting for the moment when someone racks the slide on their gun and ejects a perfectly good cartridge on the ground.

Richard had several NDE's in
Ab Aeterno - the reprieve from the gallows once he realized he knew English (from reading the English Bible?) and then again in the hold of the Black Rock, the sword, Smokey attack, the dehydration, the boar attack, and finally having his head held underwater until Jacob asked "Why should I stop?" and he replied "because I want to live". I imagine a good near death experience, the kind you survive, would do that to ya.
Also interesting how Ben's brush with a tumor went down. When cancer happens I imagine one does a lot of soul searching but in Ben's case a spinal surgeon showed up out of the blue. I don't think Ben learned much from his brush with death.
Who else? Hurley almost went over the edge of a cliff, and so did Sawyer. Hurley was saved by Libby and Sawyer probably felt he owed Locke/MiB a little something after his help in getting a grip on the cliff ladder. Locke of course with his fall from the building that broke his back, but even with Jacob there giving him his patented Touch he didn't seem to "get it" until he got to the island.
Kelvin, Minkowski, Libby, Anna Lucia, Boone, Shanon, should remind us that sometimes a near death experience ends with death.
"Life can only be understood backwards; but it must be lived forwards." - Soren Kierkegaard