Yes, absolutely, it's an indispensable tool - and I've been doing this software gig since 1990. Some languages, like JS and Python which are quickly interpreted

Yes, absolutely, it's an indispensable tool - and I've been doing this software gig since 1990. Some languages, like JS and Python which are quickly interpreted, are amenable to printf debugging, while others, like C++, C, Go, really benefit from debugging. A debugger is your best bet at debugging multiple threads, for example, especially since you can pause them at strategic locations to recreate a race condition. This is really difficult with printfs. The world of JS development has tremendously powerful live runtimes/debuggers in the browser developer tools, those are a fine example of what a debugger can be. I write go using Goland by JetBrains, which uses Delve under the covers as a debugger. Compared to dbx (which was amazing), gdb, etc, it's deficient, but better than nothing.