If you love YouTube and hate advertising, then Premium is a very easy decision to make. I'm more than happy to pay Google $12 a month so I can have an ad-free experience on my TV, iPad, phone, and computer.
I have both Netflix and HBO-Now as well, but I'm thinking about canceling them, as 90% of my viewing time is spent on YouTube.
One really nice thing about YouTube is that you can download your favorite programs there with "youtube-dl". I don't know if that works for the premium stuff though (I doubt it). So if you want to download, for instance, all the Rick Steves episodes and then watch them on your plane flight (where you don't have free internet access, or someplace else where the service isn't fast enough to watch YT), it's easy to do, and impossible with those other services.
I have both Netflix and HBO-Now as well, but I'm thinking about canceling them, as 90% of my viewing time is spent on YouTube.