Yeah, early in my career I got by with gedit on Ubuntu but before too long a 700,000+ line PHP project with deep, deep inheritance trees showed up and I very much embraced an IDE.

Would running a command line debugger be too different from your approach.

I would consider bothering with some static analysis tool, but definitely not with php or other runtime heavy languages.

They tend to have this nasty habit of running the entire world, though.

Rarely, it's mostly small projects, but many many many of them.

Proudly written on a device run by a huge collection of huge projects