In Visual Studio, creating a custom keybinding appears to involve three dropdown menus, a dialog box, and at least two UI controls.
In Emacs or Vim, it's a single line of code you add to your initialization file.
I think there may be different definitions of "easy" in play here. I'll concede that Visual Studio makes custom keybindings possible, but so does any text editor worthy of even momentary consideration as a professional tool.
And I'll take your challenge. Here's something I can do in Emacs: I can take a spreadsheet received from a client, full of intended configuration settings for a custom internal application. I can export it as CSV, load it in Emacs as such, and extract the relevant sections of the content into tables in a plaintext Org-mode document. I can then add a function to that document, in whatever language I choose, which will receive the contents of those tables as structured data in the language's own idiom, and generate the collection of complex SQL statements necessary to implement the desired configuration. From there I can decide whether I want this SQL script inserted into the document I'm writing, or written out to a file that I can copy to a remote host and feed to the SQL monitor. Or I can instead have Emacs itself connect to the target RDBMS and apply the configuration directly. Or any combination of those. And once the document's written, I can do all this with a single keystroke. Another single keystroke exports the document to HTML, so I can share it with the client to demonstrate exactly how their intent has been translated to reality, and with colleagues so they can see what's been done.
Perhaps that sounds fantastic to some. For me, it's Thursday before last. It took a little less than an hour.
I'm sure Visual Studio suits your needs quite well. I'm glad of that; everyone should have a tool that does what they need it to. But Visual Studio, from all I've seen of it, does very little to expand the scope of what you can do. Those of us who are fond of Emacs or Vim are so because, by comparison with something like Visual Studio, Emacs and Vim give you superpowers.