If you have an opportunity to learn a new platform or technology, take it. Every environment has a different way of organizing, implementing, troubleshooting, etc. Each one you learn gives you a new way to look at a project, and teaches you something about how other people may think about projects, problems, and solutions.

People who stick with the same tech for decades are also stuck with the same approach to new projects. When the only tool you have is a hammer, every problem looks like a nail, and all that. Get more tools in your tool belt.