I have the same problem. Siri worked before on my 4s, but now the purple line just spins around forever and it never does anything )-: hope it gets fixes. I've heard Siri will work now in Europe and I'd like to start using her.
You can download the free You Tube app in the App Store. The included app in the prior iOS is gone. I would assume that saving videos are done as a playlist as part of your You Tube account correct? If so, it would still be able to be accessed via the stand alone You Tube App.