Not a huge user of screensharing, but it does come up, and I'd probably miss it if I lost it. Here's a few recent examples:

• Playing a 1v1 PVP game, such as Elden Ring or Armoured Core, taking turns with 3 players, it's nice to be able to share POVs so that the waiting player can watch.
• Setting up for a TTRPG, it was nice to share the online character builder to more easily ask for advice on something like "which move should I take?".
• Playing Valheim, we all died except 1, and he shared his screen so we could guide him to our bodies with the materials to build a portal for us to get back easily.

I'm certainly not sharing my screen all the time, but it comes up fairly often that something happens that you want to show the group when they can't just look at it with you in-game. It all depends on what kinds of games you're playing and how large a group you're playing with.