I'll say upfront I'm a blue badge holder. If the car park is on private property then the D/bays are not enforceable except by the owner or his agents so if they agree or can't be arsed to stop you then go ahead.
However without the D/bays close by many places are inaccessible. Say I came into you your carpark to pick up a missed package, if I can't park close to the door then I'm screwed. If I had to park in a bay more than ten or 15 meters away then I can't actually walk to the door and back and have to use my mobility scooter. Getting that in and out of the car takes about 5 minutes plus another 5-10 minutes to recover from the effort involved. So by blocking the bay you add 20-30 minutes to a 10 minute trip out to pick up a package plus I'll probably need my meds during my recovery time. Many times I've gone places, not been able to get a D/bay and had to just turn around and go home. Maybe just that one time you could have parked outside and got your Mrs to walk across the car park.
At least on the bike I just park right by the door