I've written C# professionally for many years, though it's far from my favorite language. I write 90% of it in Emacs, reserving Visual Studio for managing .csproj and .sln files and unit testing with the Visual Studio test framework. Once my workplace switches over to .NET Core, I hope to be able to get rid of those uses. Actually writing C# in Emacs has been fine for years, with Omnisharp, and now with LSP is about on par with VSCode, except you have the rest of Emacs available at a keystroke.

I've tried Java with LSP, and I think it's on par with Eclipse rather than JetBrains these days. The language server is fine, but I've never gotten it to understand, e.g., an Android Studio project.