[Animats]

(Syntax highlighting) is the one feature that turns a text editor into a code editor.

Syntax highlighting is eye candy. Automatic indentation is what turns a text editor into a code editor.

[farnsworth]

Automatic indentation saves a few keystrokes. A languages service (go to definition, etc) is what turns a text editor into a code editor!

[whatever_dude]

A language service is for people with poor memory. A terminal window is what turns a text editor into a code editor.

[flamedoge]

I need OOP navigator to use C++/Java/C#

[hex13]

I think support for butterflies is what turns a text editor into a code editor (xkcd#378) XD