Agreed. It’s so good it feels like it should have been that way all along. For example, when you view the help for a function Emacs has always given you a link

Agreed. It’s so good it feels like it should have been that way all along. For example, when you view the help for a function Emacs has always given you a link to the source code where that function is defined. Helpful shows you the source code right in the Help buffer, and shows you a list of callers, and gives you buttons that enable tracing or debugging for the function. Once I discovered Helpful, all of those things seemed so obviously useful that I can’t understand why nobody else thought to put them there, including myself.