Very often, the complexity arises from event-driven code. If I could just see more easily the event flow, I would understand the code better. A stack trace in a debugger won't tell you what events led you to the current state.

It never ceases to amaze me how advanced technology can make simple things complicated.

There is also a nice application of moldable exceptions that provide automated fixes for common errors in defining custom views.

Well, normally you would debug your custom views before installing them in the debugger, but you always have the standard debugger as a fallback.