Light table looks to me (with all the respect due to the work of the authors) like a fad where people get all hyped up about a product. I mean there's nothing revolutionary and while looking at the video I was thinking "boy this is too confusing!". I also believe that when the project is going to have 500+ lines of code per file, the way it's done now, is going to be horrible to deal with it!
There are other stuff that bug me out: when I program I don't want rounded borders and everything. I don't want 40 different colors.
But if people are going to be it, great.