I’m a full .NET Developer, and it honestly only took me a week to ‘catch’ up to the C++ workflow. First of , UE4’s C++ is a lot easier than normal C++. Garbage collection is done for you, and it comes with a ton of helper classes and functions , and you don’t need to use the C++ std library at . For me the only real frustrating part - is dealing with header files. I hate those things! 
Also, Blueprints are not just for artists - they are great for seasoned programmers too. You can test out features of the engine really quickly with blueprints, and make quick changes, which is why I use them for visual aspects of my code as I am tweaking part of my game constantly. Not only that, there is alot more you can do with blueprints if you understand programming.
Lastly, I find it kind of silly these C# developers coming in here complaining about lack of support for their current favorite language… I mean really if you are a good developer you should be able to pick up most languages pretty quickly (and its not likely you are picking up UE4 for one quick project where the investment wouldn’t be worth it). You will spend more learning and understanding the framework then you will ever syntax. And has a ‘favorite’ language, why should it even be C#? Why not Javascript? Ruby? Python? popular languages.