We've been visiting AC since 1991 and traffic direction never seemed an issue until the "busy weekends." Of course, everything changes and has.
Now with more tourists and residents, even I am sometimes confused which roads are one-way. I do try to remember....
I think tourists, especially, don't realize that a bicycle in traffic is just as important as a golf cart (for instance)in San Pedro.
I hate the idea of more signage, but in this instance I believe it's a good idea. Not only for safety, but also because of the frustration the residents must suffer.