I think groovy is sensless language. You lost all Java benefits like checked exceptions, robust code... what is about debugging? And you is not faster developing with groovy. You developing faster if you ensure quality and not inline filters or other crap. If you like groovy, look at Python.
I've used it _alot_ especially for scripting. Really powerful support for quickly write dynamic code to run transformations, connect to db's, connect to mq's etc. It's easier to read than python (for me) and you can just drop a lib in groovy_home for support to whatever dbdriver (like oracle). Seriously give it a go, before you call it senseless. But you know, use what you know and what you can be effective with to solve a given problem.
You're wrong there. I use Java for most things but dive into Groovy when I want features like almost native XML handling (via XmlSlurper & MarkupBuilder). Having a joint Java + Groovy project is simple as it's all just bytecode to the IDE.
