1 in 2 professional developers use Linux ( many of the others probably use Macs ).
If you are working with containers ( the cloud ), Linux is the native environment. So Linux provides a great environment for most of what is headed for AWS or Azure. If you are building websites ( eg. React ), Linux is the nicest environment to work in. Node is best on Linux. Java and Python IDEs work great on Linux. C / C++ work is often embedded with is often Linux and again the tooling works great on Linux. The more offbeat your platform choice, the more likely it is to be Linux first ( Gleam anyone? ). Even the .NET experience is great on Linux ( maybe better than Windows depending on what you are building ).