I did, too, until this month.
This past month my artificial knee became infected and had to be removed surgically. I was very grateful to have a Wall Mart greeter show me how to use the electric carts and to help me with my crutches. ( They have a special storage cabinet for them.)
(Hopefully, if the infection is gone, I will get a new knee in March. )
Glad they helped you with your knee, but I dislike all greeters.
When I am on my way somewhere with a list and thoughts in my head about something I might have forgotten, do not want to deal with extra chit-chat.
Especially dislike bank greeters, though. Just let me get to the window and get out. Already I will have to talk to the teller anyway.