For people making disaster preparations for the 'apocalypse', as far as things go, I'm not certain how helpful a few tins of food and some tea candles would be in the event of, say, the end of the world.
If the world is doomed, I wouldn't want to live. Imagine the total loss of modern infrastructure; I don't think we'll be able to climb out of such a mess anytime soon, if anything on that scale happens.
Now of course most people taking in the end of days nonsense will say, well, we're not expecting a disaster on that scale. Maybe something less severe, but a disaster nonetheless. A sort of lukewarm threat, perhaps.
I find that the scenarios where the 'disaster preparations' would come in useful are pretty much on the harmless side of the continuum. Surely, anything worth worrying about such that it deserves a special mention must have a greater impact, otherwise the Mayans are not only alarmists, but alarmists with a great tendency for omission.
Of course, it's much easier to say that everyone is nuts.