We interact with people from numerous Spanish speaking countries as part of an intern program, and the one thing every new group says is how funny each other’s slang sounds to the rest of the group. She might have a rough month or two, but then I think it would be fairly smooth after that.
The biggest problem in the US is how the insurance companies insert themselves between the doctor and patient, and tell you what services you’re allowed to receive without even being in the room for the diagnosis.