I subscribe to the standard plan as well. Netflix has a lot of content. I don't think they have enough that is worth upgrading for a premium plan $24.99 which includes:
4K (Ultra HD) + HDR and Netflix spatial audio. Which also includes:
Download
on 6 supported devices at a time
Option to add up to 2 extra members who don't live with you
I predict, get ready for a price hike sometime next year. Also, it would be nice to bundle couple more streaming networks together for the right offer.
HBO Max and Netflix
They're already a bundle deal of Disney+, Hulu and HBO Max. I use to subscribed to that for a while and saved some money. Sometime next year Hulu will be eliminated and incorporated into Disney+. Who knows if it will affect that offer or not.