Absolutely understand your pain—manually importing, editing, and organizing YouTube videos for Plex or Jellyfin can get overwhelming fast, especially with large playlists! Here are some ideas:

1. Tube Archivist
This is a self-hosted solution designed exactly for archiving YouTube content. It’s Docker-based and has a web UI, so you don’t need to mess with command-line scripts if you don’t want to.
https://www.tubearchivist.com/

2. YoutubeDL-Material
Another web-based frontend for yt-dlp/youtube-dl. https://github.com/Tzahi12345/YoutubeDL-Material

3. yt-dlp with Metadata Options
If you’re open to a little scripting, yt-dlp can be used. You can then use small scripts to import this info into Plex/Jellyfin, or at least batch rename and organize files.

4. Transcript Extraction
If you want to save transcripts for reference or searching, Transcriptly can help automate that part.

Hope this helps you reclaim your time and enjoy your video collection more!