This is where I am, too - long time .NET dev, have gotten increasingly frustrated with Visual Studio's awful performance, especially with ReSharper. I've tried taking that out given VS has a bunch of that stuff built in, but working without R# completions feels like trying to work with one arm tied behind my back.

Between that and my preference for Macs for my personal laptops -- and I've been very excited at how good .NET Core has gotten on non-Windows platforms -- as well as a ~3 year sojourn working with Java 8/11 in IntelliJ, I've gotten very comfortable working with JetBrains IDEs and generally prefer them when I have the option. Structure View is great, the search is nice and snappy.

The only thing that frustrates me with Rider is I don't think you can apply fixes from Roslyn analyzers at the file/project/solution level like you can in VS. We enforce our team's coding standards using those, so it's a minor pain point, but not enough to get me to stop using Rider given how much faster it is.

Having worked mostly on solutions with at least one Web project in the mix, it's even worse. I absolutely love VS Code, but VS itself is a beast that I just avoid opening if I can at all avoid it.

VS Code isn't quite as good on C# projects, I will admit, but still so much better (less blocking) in general.

Not familiar with Rider though.