[dastx]

Depends really. If I've just joined a place where I've got no clue how the code works, the best thing I can do is use a debugger. It will make me understand how the code works, and will get me to the bugs quicker.

I agree though. If someone knows the code intimately and still doesn't have a rough clue about why a bug exists, and the first thing they do is look at the programs entry point and step into all the way until something pops out, it certainly will take you forever. And in this context, OP is certainly right.