I use debug logs extensively. I log a LOT. I can put the logs and code next to each other and trace through the code. So much better than a debugger. With the logs, I don't have to worry about timers or concurrency or any of that. I can take my time and read the code and reason about what's going on.

Edit: Logging helps me look at what is going on in prod as well. I can trace messages/transactions completely through the path and if there's an issue, I'll see it.