It’s used in the New Roman Missal. Right where we all used to say “Lord, Have Mercy”.
Only now instead we say “Kyrie Eleison”.
The result being at least half the people don’t participate because they don’t know how to pronounce it, and all of the younger people give funny stares and say “Huh? What does THAT mean?”
But the Cardinals and Powers in Rome who are far, far smarter than all the rest of us feel the American flock needs to be preached to in Greek apparently.
Our priest sings it and we echo. A good way to learn how to pronounce it.
At Benediction we also sing the hymns in Latin.