What I love about the KJV is that Queen Elizabeth had encouraged an entire nation of poets, and they were still around for James. It was cool to write poetry, and everybody did it. (She banged out a few decent verses herself, for that matter.)

Even today, KJV is the "voice of God". When you want to write a divine voice, you mimic KJV. "Thou shalt not..." just sounds more authoritative than "Don't", even though they mean the same thing. (I'd argue that "don't" better preserves the meaning, which was not meant to sound archaic. "Thou" sounded informal in the 17th century, but that's not how it sounds now.)

The flaws in KJV run deep; it's a very opinionated translation. Which is fine; every translation is opinionated. But there's a risk that people assume it's definitive because it's so powerful. There are some who literally claim that it is truly definitive -- even more so than the Hebrew and Greek originals. (This is of course insane, and that's the fault of horrific theology rather than the translation.)