From my perspective, in most places there aren't enough! I don't know where you folks are shopping that here are always empty handicapped bays, but I want to move there!
In my experience, it is difficult to find open handicapped parking at most supermarkets, walmart, and such. I live in a large city, so that may be why, I don't know.
I have a myriad of conditions (as many do) that limit my mobility. Sometimes I use a wheelchair, otherwise I use a cane, or two canes, or a walker, and have done so for the past 17 years. My husband has a heart condition. Neither of us can be up and about for more than an hour at a time ... including the time it takes to get ready, driving time, and time getting back into the house and put things away. This means we have about a half hour to run our errands, do shopping. Time spent looking for parking quickly narrows the time we have to do what we need to.
A lot of disabilities are invisible ... people who for various reasons can't walk very far at a time. People with cancer, heart disease, lung disease, and many other illnesses all fit into this category. And yes, some have nice cars ... many people were very successful before being disabled, and many can still work and ARE successful. so what? You will also see a lot of old cars, for the people like us who live on a miniscule disability pension - and darn thankful to have it.
To address the person who made the statement about fat people ... most fat people are not disabled because they are fat. They have become fat because they are disabled! I am fat now, and I was a svelte model 17 years ago. The meds I have to take, the limited mobility, frequent bouts of being bedridden, and a messed up metabolism put the pounds on. This, unfortunately, is all too common a story.
For those of you who get angry because you have to park further away, you never know when you are going to be the one needing those empty bays ... and then you will truly understand how important they are for those who need them just to function.