(Graphical) IDE's are great for development, but they're slow to start and heavy to run. Sometimes you just want to take a quick look at an xml or dockerfile and you don't want to spin up the whole IDE for that.
I've recently rediscovered notepad++ for that (on windows), what's your prefered easy-acces-tekst-editor?
It's the best solution for editing huge text files in Windows. The other text editors slow to a crawl with big files, but gvim has no problem.