I kind of agree with all the comments here for both sides but how can places like Costco (other supermarkets are available) have huge parking spaces, maybe because of the American influence do you think, personally living where I do I would gladly see a reduction in number of spaces to allow for larger spaces, most of the supermarkets around here, I have never seen the carpark full enough that a few spaces less would matter.
I realise that wouldn't work everywhere but where its possible it would be useful.
One car park not far away the spaces are so small on one occasion in the Z3 I could only squeeze between the car and open the door enough to reach the roof clips, managed to drop the roof and get the handbrake off and push the car forward enough to get in, I laughed (not), it was raining too, fortunately it was level ground......
Glad I don't have a car with big gullwing doors....
Maybe if all cars had sliding doors the problem would be solved.