Oh I bloody love the "park further away and walk a bit more" advice.
The number of times I've parked in the middle of any empty row nowhere near Blue Badge or P&C spaces, and come back to a car parked so clode to mine, I cannot open the boot.
For my sins, I'm stupid enough to park with my bonnet facing forward, to avoid the jaywalkers trundling along behind the cars (young children and elderly included).
Who'd have guessed in a supermarket carpark, I'd want to open my boot. Not even wheel my trolley round, I'll leave it in front of my car , but I don't expect to move my car forward 
Couple of years ago, I left a space behind my car, about 18". A mahooosive 4x4 was parked behind me, into my space, with the bumper actually touching my reaer window 
Trust me, if I could've climbed on the bonnet and had a shit, I would have. One advantage of IBS , I 'spose ......