MawTheMerrier, to me it sounds like sensible forward planning to me - with a bit of initial panic thrown in, although it sounds like you soon recovered from that. But, IMHO, not panic buying.
Prior to 1st lockdown, like many others, I witnessed what I would describe as panic buying - people madly filling their trollies with as much of what they thought would run out. Some had up to 4 trollies full of (different) stuff - something I normally only see in the run up to Christmas.
I'm another one who keeps a well-stocked pantry of dried and tinned goods. I don't keep a lot - perhaps 4-5 tins of one thing at most - and not all bought at the same time.
I know a couple of people who use their spare room to keep 'extras' and one person who always makes sure he has enough food laid by to last a year...
A lot of my extras are 'ooh, it is on offer so I'll get a couple' or when it proves cheaper to buy in bulk. For instance, I get a pack of 36 loo rolls at a time (I would get more - and have a bigger saving - but my version of Dolores can't hold more!) Lasts me a long time and although more expensive at point of purchase works out cheaper per roll than the smaller packs.
My freezers are kept well stocked - well, they run better and are more energy efficient that way, aren't they
. But again, they hold a few 'special offers' - even yellow sticker prices.
One time my supermarket meat reduced shelves were stocked to overflowing (no joke - a member of staff had forgotten the fridge 'out the back' so almost a large fridgeful was o.o.d. the next day!) Several of us got quite the haul that day. Some were just grabbing anything they could get their hands on but I did my 'will I use it? Do I have enough room in the freezers?' check before stocking up on some marvellous bargains - 500g minced beef for 20p anyone?