The short story of my experience with C# is that it is like Java should have been.
C# has now gotten to allow programmers to build cross-platform applications, includin games. Unity engine has made it possible to write games form most platforms in a memory-safe nice-to-use language.
VS used to be the best possible IDE to work with and intellisense was just perfect and lightning fast for C#. Debugging was a flawless experience.
For a company that wanted to build desktop applications it was just a matter of drag-dropping components in the editor and the UI was ready. UX developers could just easily cooperate with the programmers as it was immediate to connect a UI component with the code that run on its events. If a company wanted to build a web app instead, they had ASP and MVC frameworks to do so.
In Java it is quite bothersome to have to specify getters and setters for everything just in case future access to a private field would require to run some logic. C# addresses this smoothly: a field can just be a public field of a class and in the future it can always be refactored to have accessors and setters without modifying the user code. This is just one small example on how C# is built to scale.
When C# introduced delegates it was the first widespread OOP language to provide such a feature, and it really made it possible to write new kinds of programs.
Starting a thread was seamless and synchronization and orchestration primitives were easily available
The framework provided everything: from image manipulation to low-level network access (even if it felt all clunky IMO)
The introduction of Async-Await is one of the few things that brought me away from it: the paradigm is terrible and it is a footgun most of the time.
As much as the language itself was cross platform, most of the stdlib was only available on windows
OOP is limited and forces programmers to adopt slow (videogames have a pretty strong speed requirement) and counterintuitive patterns (building data-oriented or pseudo-functional code always felt wrong, like fighting the language)
VS got slower and slower and slower over time, it also only works on windows, so that was a big failure point.