One workaround you can use is to add the videos to your Watch Later list in chronological order, since that is first in-first out. I do this with my subscriptions after coming back from holiday, since I normally don't have 10 hours spare to get caught up straight away, and it's easier than scrolling down your subscriptions list to see where you left off each time.

Of course, this begs the question of why Google can't just port the code for this over to regular playlists.