I think that P&C spaces have a place. The wider spaces make it a million times easier to get car seats in, be able to reach in and buckle up seat belts, etc.
My kids are older now but when they were younger, I remember several times coming back to my car to find some knob her had parked so close, I couldn't get in the car, let alone get my DD in there. I've never owned a tank of a car either.
I do think they're in the wrong place though. They don't need to be right by the doors.
One of my local supermarkets has recently been extended and had a new car park. The P&C spaces are now away from the store along one side, with a paved footpath leading into the store.
The 'I'm just popping in' brigade don't park in them anymore.
However, there's now a row of disabled spaces along the front of the store where the P&C spaces used to be, so they just park in them instead 