I prep, but in a quite minor way. I like to keep tins and dried food in the cupboard, make sure we have cash in the house, and torches in good order. I have a rucksack with some spare important bits in, and keep some shoes, coats handbag and dog leads by the front door.
I am old enough to have been through some rough winters, where shops and services were out of action for a few days. In (I think) 1991, there was a picture on the front of a national newspaper of my road, a main road just outside South Croydon, knee deep in snow, no traffic, no people, nothing. (My house looked beautiful, btw 
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In 1987, when the hurricane hit, we lived in a small town and lost power for two days, no schools were open, the doctors were shut, and roads blocked, telephone lines were downed. My friend who lived in another nearby very posh large village, had no electricity for a week, and couldn't drive anywhere for days. And she had toddlers at the time, and no food, nappies or source of heat in the house.
I have been stuck overnight in queues of traffic. And I have had to leave the house in emergency situations at a seconds notice (long complicated stories).
So, for me, it's important that I am organised and ready, just in case. I live in a lovely village on the south coast now - good infrastructure, for example a little big-name supermarket, doctor surgery, two part time banks, lots of independent shops etc. But only one road goes here from the nearest town, so it would be very easy to be blocked off, by snow or flooding. Then the cashpoints/supermarket/lovely little greengrocers/teeny tiny Boots, would be out of stock in no time.
I am a planner by nature anyway 