You seem to be coming from an admin/ops perspective. From developer's perspective it's two modern mainstream languages - F#, C# - that can be used on Windows,

You seem to be coming from an admin/ops perspective. From developer's perspective it's two modern mainstream languages - F#, C# - that can be used on Windows, Azure, Mac, iOS, Android, WP as a well-defined workflow. The best IDE - Visual Studio + ReSharper + soon Roslyn. Second best ecosystem of libraries, that is picking up. There are some missing bits that are coming: docker and containers, dynamic compilation (of static typed code) when building web sites. It might not be the best choice in individual "disciplines", but it's the best overall.