I remember using Notepad++ back in the day (way over a decade ago when I still used Windows), mainly for it's speed and effortlessness in opening huge files, but also quite advanced feature set.
> I just haven't found anything I like better than it
I can personally highly recommend Sublime Text. The clear downside is that it costs money and is proprietary (the free version is usable though, with a nag screen) but it's lightning fast (and as Notepad++ also handles huge files gracefully) and highly extensible (although the built-in features are way more than enough for text editor use).
For me, I've developed this workflow where I'll use Sublime or VSCode for active development, then Notepad++ for one-off files, or as a kind of on-going scratchpad. There's no reason I couldn't use the other editors the same way, but it's become so ingrained into how I operate it's difficult for me to change my ways.
> I just haven't found anything I like better than it
I can personally highly recommend Sublime Text. The clear downside is that it costs money and is proprietary (the free version is usable though, with a nag screen) but it's lightning fast (and as Notepad++ also handles huge files gracefully) and highly extensible (although the built-in features are way more than enough for text editor use).