I'm not frightened, though others might be. I have at least a hundred projects and a) don't have time to integrate Grunt with them and b) the cost/benefit equation doesn't look like it would pay off. MyComponent will already minify and concatenate .JS files and there's only one .CSS file per project (and they shouldn't be concatenated across projects). I also haven't had time to integrate SASS with them (and won't any time soon), so there's nothing to gain there.
The one task I'd like to use Grunt for is processing the e-version of my book, but several of the steps can't be done from the command line, so that's out as well.
(As an aside, if anyone ever asks you to do an e-book version of a 800 page book full of lists and code, just say no)
It is a great article, though.