I've used it for years. In order to generate the models you had to use the visual designer which was slow and buggy.

Generally annoying experience if you have to clock in and out every day to watch that UI break your database relations whenever you click save.

No one uses it today, or in the last 5 years or so I presume. You use https://learn.microsoft.com/en-us/ef/core/modeling/#use-data...

This was a completely separate, legacy extension of VS, not EF let alone EF Core.

Completely separate is pushing it since it was recommended by Microsoft, but yes, I am old and times have changed.