As someone that used all their products from MS-DOS, through Windows 3.x days up to switching to Visual C++ 6.0, I clearly remeber code completion, syntax highlighting and macros, three features that Notepad isn't capable of.
As easily proven, by reading the manuals available in Bitsavers.
So replace Notepad with Notepad++ in my previous comments. There are definitely fast editors that do the same thing as Borland editors did back then the ones like VSC do a whole lot more and support a whole lot more.
It was a DOS, Turbo Vision application.