Back in the day it may have been UltraEdit, but these days I'm sure there's something else. I've been using Notepad++ because it's FOSS, but it is probably too quirky to be an analogue

Perhaps Notepad++?

I liked Programmer's Notepad but I don't think it had the same power as BBEdit.

Programmer's Notepad is amazing, its been my goto in Windows for well over a decade at this point. Has everything I need without any bloat, also work fine on large files (I often do regex-searches on huge log files with it).