- Edited
[deleted] My original suggestion is more about making a separation between "I approve of this video" and "I want this in my collection", which SLR currently conflates. It's not supposed to be "like" and "also like". On VT you don't have a real way to look at what you've thumbs-upped, just what you've favorited for your collection. Right now, for SLR thumbs-upping is adding to your collection, so you have to keep what you approve, and vice versa.
Having a Watch Later icon would help and basically work the same way as "like" and "collect", but ideally it'd be something that you can click/unclick while browsing, like the current heart; I'd want it to be as convenient to use as hearting is now. Having it purely be visual and still needing to go into the menu dropdown to add things to Watch Later would be less usable.