Yes and no. I use logging too, but that's only useful when I know (or can guess) ahead of time what locations and what things at each location I'll need to know

Yes and no. I use logging too, but that's only useful when I know (or can guess) ahead of time what locations and what things at each location I'll need to know in order to diagnose the problem. Of course I can always go back and add some logging, but it's not a given that I'll want to keep it around after the problem is fixed. For example if it's in a performance-critical section of code, even the cost of checking to see whether logging is enabled may be too great. And in any case every log statement does add visual noise to the code.