Scala works beautifully with IDEA IDE, one of the best IDE out there! GUI debugger just works out of the box.
I tried using Go for a little bit but I find IDE and tooling support for Go is a bit lacking. Do people consider these aspects anymore when they evaluate a new language? A proper IDE support can greatly boost your productivity!
I'm pretty sure GDB works now too, but again I have never really felt the need for it. But then, I've never really felt the need for syntax highlighting, code folding, or auto-completed function names. I feel like if my Go code has reached a level of complexity where it needs those things, I've done something wrong. My IDE is Acme, it lets me edit files, run my build scripts, and execute test programs.
Maybe I should just delete all these repos I've worked on for my job, the cluster management tool, the pedestrian simulator, the GSM radio emulator, the VM monitoring infrastructure, the distributed key-value store. They were written in Go, so I guess they weren't real programs.
However, I'm still sticking to my point. Debugging your code using Printf feels like 1990s.
Maybe debuggers are useful to you in other scenarios, but they are by no means necessary. You don't need to be inflammatory about it.
My style is to only log when I'm debugging a failure I don't understand. Then I remove the log output.
I also make sure that my unit tests cover the problem case I was debugging, because problems that require this kind of detailed debugging tend to be the trickiest to keep maintained without regressions. And I try to make my code based on careful state management (or, if possible, statelessness), preferably with a state machine.
There's still a lot to do, and much of that is stuck in my head at this time, but I'll do my best to put it all with the source soon. Plus I gotta work on "presenting" it a bit better (in a way that is more friendly towards other people seeing its long-term value and getting them interested in collaborating).