So, I found out today (it's a new feature, I still have tabs that are missing it because I haven't refreshed them yet) that they added a white button "+ save" which adds the whole playlist/suggestions to a new playlist AND now click on individual songs "add to playlist" adds to the latest created playlist.
Well, this becomes old fast :). I usually have to click 40 songs and add them to a new playlist. There are some firefox extension that can extract URL and rebuild playlist but they are a bit buggy.
How about hover on each suggestion and add it to "Watch Later" or even Queue? That also works, at least for me.