I’ve only used older versions of VS, but I have several .NET friends that swear by it. From what you say I’d definitely check VS Code out, but it probably won’t have every feature of VS 2015.

Code has no .sln/project files by design. However, adding the root folder of your project should be all you have to do each time you start it up and it’ll detect all build tasks etc. When I work on multiple projects at the same time I just keep multiple windows open.