ADA real world experience

The Americans with Disabilities Act (ADA)is a great start, but it's implementation is remarkably flawed in a way I never imagined before I became disabled.  Restrooms designated as ADA are often far too small to fit a wheelchair. I don't need a wheelchair,  but I do need a grab bar on my right. Public ADA restrooms often have grab bars on one side but not the other. It can't be that much more expensive to install them on both sides so that the stall would be accessible to more people who need them. 

We are all familiar with the buttons that open doors automatically when you push them. I use them often but find them remarkably absent in places where they would be most needed, including restaurants, physician's clinics or stores. Absent the push plate, I'm unlikely to be able to open a heavy door myself. I'm also navigating walking with a cane on my right side. I even go to several places specifically designed to serve handicapped people where the restroom doors are too heavy for me to open without assistance.  

Handicapped parking spots often abut regular ones leaving little to no room for a wheelchair to unload or load. It's often the case that when I get out of my car parked in the handicapped spot, I find a four nch step to the curb.  It's likely that if an individual needs a handicapped parking spot, they can't safely navigate a four or five inch rise from the parking spot to the curb. It seems obvious, but shouldn't there always be a ramp from a ADA parking spot to the curb or elevators and more space between two handicapped spaces or the handicapped spot and a cement wall or post?

I'm not expecting perfection, but I think small changes like these could make the world more manageable for disabled people.