If you use it, you'll never go back. Rob Pavey, the developer, is a genius. That reminds me, I need to give him a WW award.
Example... you have someone for whom you need to create a bio and add sources. Go to Family Search and you see they have 10 sources. Evaluate the sources and if they all look good you click one button in the extension, called "Build all Citations" and then paste it into the WT bio. It will add a narrative for every citation, and builds family tables (you can choose to go with lists instead of tables if you don't like the tables.). Boom, bio complete. Just need proofreading and adding some "color" if you want.
I will then check Ancestry to see if it has anything useful that FS does not. If you find a record you want to use, click the Build Narrative with Citation option in Sourcer and paste it into the bio. The Sourcer will automatically produce an Ancestry "sharing" link.
The extension does a number of other useful tasks but this particular one has saved me hours upon hours of time.
There's a tutorial on the WT Youtube page
https://www.youtube.com/watch?v=6DvAm1zV2X0&t=1297s