Yeah, that seems to be about how it works out.
My only advice would be for people to talk to their own priest, as well as the priest of the church they are thinking of visiting, before considering communing in a different church. Some churches and priests are more strict and conservative about these things than others.
I myself will visit EO churches, but I don't commune in them, as I don't want to break any rules. I find that to be the wisest approach. I know others disagree. With the exception of the agreement between the Syriac Church and the Antiochians, we are really still out of communion. I think it is better to pray and wait for a formal reunification before communing with each other. It somehow seems more respectful.