No. I consulted two automation projects using Groovy (by the way, I programmed Java over 10 years and knew Groovy), both failed badly. I am writing one article now on why 'own automation framework' (this one using Groovy) failed. I rescued these two projects by reimplementing the tests in raw Selenium + RSpec. Every one agreed it is better in every way: faster, more reliable, easier to learn, easier to read, easier to maintain, no dependency, ...