Personally, intro-skipper is my absolute must-have.
Also, media cleaner is good for those who watch a lot of content but then don't want to keep it. It's controversial as most users want to keep content. But you can configure to keep your favourites. I do this for films, but then tv shows I watch once and let it clean up after me as I don't care to see it again. Combined with the *arrs for fetching content, it means I don't need to ever manage tv shows.