ReSharper is a code analysis and debugging tool available as an extender to Visual Studio. Its features are also present in JetBrain's .NET IDE, Rider.
ReSharper is suitable for all legacy and new projects. It helps keep the code clean, short and understandable. The color codes help you quickly identify what you are looking for, and the shortcuts are the best. While Visual Studio made progress on these points on its own, it seems to me that ReSharper has a lot to offer. Today it happens to me that I can't think of another productivity tool without thinking of ReSharper first.
ReSharper is very familiar if you already know Visual Studio. JetBrains does have an excellent IDE (Rider); however, since ReSharper is an extension to Visual Studio, you only need to learn what their tools add, not a whole new way of working. I have found the extension's interface to be straightforward, although perhaps due to the massive range of features, navigating the menus is a little time-consuming until your muscle memory kicks in. Maybe a feature search tool would help make usability a 10 out of 10?
ReSharper does what it does very well because it operates inside the IDE you are already using. It provides advanced features that function far above and beyond what Visual Studio Professional offers and does not require you to learn another IDE like JetBrain's excellent IDE Rider. My only wish is that ReSharper had a Visual Studio Code plugin!
