Interesting (I need to check this http://www.listen-to-english.com).
I was a bit upset at the beginning because the person didn’t mention how important it is to speak, but in the end, they say “go to the lessons to speak!”
Secondly, yes, I think it is important to speak, I mean inevitably, if you’re learning a language, there’s going to come a time when you’re going to speak.
But if you can raise your understanding level significantly, the speaking will undoubtedly follow, I think. It will then take a quick check from the grammar book or a quick pointer from the teacher and you’ll be on your way. The other way round, if you haven’t raised your understanding level first, you can do as much work as you like on “PRODUCTION” (how to speak or write) and they’ll be no point because at some point you’ll end up in a conversation with someone and you won’t understand a word they’re saying!