The visual studio one seems to cover just about every way you could use VS, and every plugin made for it. This measurement comments more on the neatness of the IDE(s) than any kind of language complexity.
Agreed. VS supports dozens of languages across web, desktop, mobile, etc. C#, VB, F#, C, C++, JavaScript, T-SQL, Python... and that's just what I can list off the top of my head. Even with single languages in the list it's not apples-to-apples. "Language complexity" should be removed from the link title.