The real nightmare comes from the undiscoverability. The right tools can help you out. Unobtrusive JavaScript used to be a nightmare, for example, until Chrome added its 'Event Listeners' tab in the developer tools. Another being the 'Go To Implementation' instead of 'Go To Definition' when writing C# with code that uses interfaces.

Yes, you need coupling when debugging. But it need not be in the libraries and code you use.