For my use case (.net development, visual studio) windows used to be superior, more efficient choice. Now, after the release of .NET Core and Visual Studio Code i might re-evaluate it.
And yet it's apparently completely foreign to you that others may make that exact same choice regarding other software?
(And this is coming from a guy that used to program entirely on text editors, because I didn't like how bloaty Eclipse was... I'm not deaf to your plight. I'm just curious that the idea of others making trade offs is so foreign to you.)
Then why are you using Windows (dozens of Gb) and not Ubuntu (<5 Gb) or Debian (<1 Gb)?