Is there really a lot of production VB.NET? I wouldn't be at all surprised to learn there is more production VB 6 code and development on that stopped two decades ago.
Yes, it is the to go programming language in life sciences corporations when Office users outgrow their VBA skills and get to have IT install VS on their computers.
I know a couple of places like this, no R, no Python, VB all the way.
Yes. Huge amounts of it. It is less relevant as time goes on but almost every .NET job will require you using some VB.NET.