This is most certainly true...I was on the JW and CATH boards for 4 years each, back in the 2000's. And what you say is true, though I did not see Catholics quote them that much. Mormons seem to quote them the most.
I was on the Catholic board for a number of years, but most of my knowledge of them come from James White's debates. For about 10-12 years James was in the "Great Debate" series in Long Island, NY, and every year he would debate a Catholic apologist on a particular topic. He debated Robert Sungenis, Gerry Matatics, Mitch Pacwa (easily the most polite debater), Art Sippo (easily the rudest), Gary Michuta, and Peter Stravinskas.
Gerry often had a book called "Jurgens", which is basically an ECF quote book, categorized by doctrine, that he would quote from, demonstrating that he didn't even know the sources of the quotes he was quoting.
The typical line they liked to give is, "This has been the 2000-year-old constant teaching of the church. There's one debate with Matatics where he was defending a teaching about Mary (I forget which), and James asked him for a Father who taught it in the first century. "Mr. White, I don't have to give you quotes from every century". Okay, how about the second century? "Again, I don't have to give you quotes from every century." How about the third century, then? "Mr. White, I don't have to give you quotes from every ECF who ever taught the doctrine." To that James replied, "I'll settle for just ONE!", and the entire audience (made up of Protestants and Catholics) roared with laughter.