Anything sufficiently interesting (in this case, truly novel) should be able to make it through from a new user, and "nice!" is about all there is really to say about the site.
Agreed, sometimes a post can just be good enough that all it takes is a few words to show your respect. Any commentary to the nuances of the project feels like arguing about whether or not Monet did a good job picking a paint store. This is definitely that kind of post.
On the other hand, my comment was going to be "where's the tab completion?" so I guess my own comment counts as content-free.
Might as well add; nice job!