* Tracing code execution paths to load the code into your mind
* Modifying state inline so you get a different path without re-running
* Modifying state like FirstName to trace just how the bugger gets into the output
* Some sophisticated debuggers like java can allow you change code, then hot recompile and deploy code LIVE.
* Suspend threads when you reach a breakpoint so you can dig around at all the multi-threaded state at that point
- Although multi-threaded debugging is where printfs shine
All of that is much more difficult with just printfs.
