I've tested using the Watch Later playlist rather than hearts to track my collection, and while it does feel good to contribute my tiny bit to the rating of the movies I like, it's definitely more painful to use. The biggest issue I have with it still turns out to be visibility; when browsing videos or looking at an individual entry, I simply can't tell whether it's on my Watch Later playlist unless I have it memorized or I click into the triple-dot submenu just to see its status, which is a huge hassle. So, @[deleted]'s suggestion about adding a Watch Later icon would be a big help. I'd still prefer the icon to be as easy to interact with as the hearts are with their one-click convenience, but just showing some sort of indicator of a movie's status on the Watch Later list without having to click into each movie's menu would still be a substantial improvement.
