> For my personal side project hobby work it's all in one file.

Ok, so this is work, but:

    find . -name '*.cs' -type f -print0 | wc --files0-from=-
    1035617 3438912 47446211 total

Not many editors are comfortable with a million line document that's 47MB. And that doesn't include generated code (which I very rarely need to look at, but is right there under F12 if I do)