I am blessed in that I completely dumped Z80 thinking and hardware and replaced it with Microsoft assembler, basic and C and a 486dx. I really did like the Microsoft PWB from MASM 6.0, it was slick, quick and with a few tricks (David Augustine's shellroom) could access external executables and do useful things then exit back to the PWB.
I did not start writing my own editors until Win3.0/1/11 but I never got the bug for using notepad style editors, I had used far more powerful editors for too long. Before I wrote the first version of QE, I used a very good editor called Programmers File Editor (PFE) which could open very large files and was very well written and I used it to write the first version of QE.
After the terrible editor in GFA basic, I swore I would never use another non pure ASCII editor and I have no feel for IDEs at all, I use the operating system to provide the environment I want with access at as many external items as I need, that's what the programmable menus are for.