I used Notes but found Custom Lists work better for me, especially by source. They've VERY helpful for organising/prioritising what to watch while I have a subscription. As I watch each title, I add brief (spoiler-free) thoughts so the list becomes a diary as well. This is the one for my current subscription to Gaga.
Those from a particular channel (Thai PBS, GMMTV, one31, Ch 3, JFF Theatre) also serve as more manageable PTW lists - when I want something with a particular flavour, I can go to that list rather than getting distracted by an over-full PTW.
You could adapt this by keeping the ones you're watching at the top of the list so their cover images will be easy to see in the Lists side bar.