CIL - just like the LLVM IR - if human readable, is not really meant to be written by hand, unlike Java. Not sure what you mean here.
Clojure and Scala seem to be tied for 2nd place popularity behind Java, but Groovy's lagging far behind. Were you looking at the bintray-maven download stats at https://bintray.com/groovy/maven/groovy/view/statistics for Groovy when you put it in with Scala and Clojure? Even tho those stats show 660,000 downloads of Groovy over the past month, click on country and you'll see 625,000 of them came from a server in China, only 12,000 from the US, and 2000 from Germany, the 3 biggest countries. Obviously the China stats are fabricated. Groovy's true popularity is far behind Scala and Clojure.