I was listening to "Ask a Bishop" (7/18 3p) on Catholic Answers Live. A guy called and said that his wife belonged to a certain "ecclesial community". This confused His Excellency, who thought he was referring to something within the Catholic church or some ecumenical entity. The guy of course was referring to what in common parlance we'd call a "church" but apparently wanted to use the theologically correct language for it (following the recent CDF document). Too bad it was lost on the clueless bishop.
I do admit the language sounded clunky but one could argue he was only using it as it's been prescribed. One could make the counterargument though that the CDF document was not directed toward colloquial use of language, only to theological/ecclesiological use of it. In other words, you can say "My brother belongs to the Lutheran church, so I have to find a Catholic church when I visit him"; you don't have to say "My brother belongs to the Lutheran ecclesiastical community" as this man was essentially saying. Sometimes context and the rules pertaining to it can be confusing and ambiguous in the Catholic Church.