To be fair, even before LLMs could spot my bugs in an instant I really only regularly used debuggers in C because it can't display arbitrary types in debug print statements.

Debuggers still have their place in algorithm heavy work, or to pull apart heap dumps to try and figure out obscure bugs.

Even LLMs use debuggers. I asked Claude to reverse engineer a closed source binary the other day. It used gdb to trace its behaviour. Didn’t even use ghidra.