Yes, I really needed to completely block Youtube via hosts. Though it's true that you DO sometimes actually really need to watch a youtube video. That's why I have my crappy old laptop available as well. It's there, but it's definitely not smooth experience.

I'm not good about asking myself whether watching a video is really a good use of my time. It's the impulse of the moment, it's just a click away, and it just happens.

That's why I have the "default" setting of no internet, and internet actually turning off every hour. I have to manually go and turn it on, and that little action (hopefully) will make me think more carefully.

It's all about adding friction...