I spent the first two years or so of my coding career writing PHP in notepad++ and only after that switched to an IDE. I rarely needed to consult the documentation on most of the weird quirks of the language because I'd memorized them.

Nowadays I'm back to a text editor rather than an IDE, though fortunately one with much more creature comforts than n++ at least.

I'm glad I went down that path, though I can't say I'd really recommend as things felt a bit simpler back then.