I disagree. I'm of the opinion that it's useful only if you're doing something you've no clue about and also don't want to gain a clue about. It's no surprise, then, that WWW garbage is typical, since it's poorly documented and a ''living standard'' and other nonsense.
If you're like me and use real languages with real standards and good books available, you're probably not going to need something such as this. I've never asked a question there and I've never needed to look at a Common Lisp question and answer; I don't think there are many Common Lisp questions and answers in general, actually. Similarly, I don't see these for APL, either. I don't believe it's a coincidence that these languages are well-documented and encourage understanding to use.
Meanwhile, ''Why does JavaScript do this?'' or ''I can't get my CSS to do this in Safari.'', sure, I can see that.