I gave specifics - people have said to me that they weren't going to use Groovy in the past because of the speed penalty. This was year ago, well before Groovy 2 or even Groovy++ was useful. As Groovy2 continues to develop and mature, I expect more people will adopt it in their toolset - obviously adoption in Grails will be a bit boost, and that will drop in the next month or so, and continue to evolve there as well.

No one has ever said to me "the name groovy conjures up drug use - I'm not going to use it". No one I know using Groovy bothers to reference "Gstrings" except as a one-time bad joke.