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Editor in the prepared new version of BlueJ can emphasize block arrangement of programs. Each of the nested block has another background color. This option can make the complicated code much more clear.
See also http://netbeans.org/bugzilla/show_bug.cgi?id=182513
Btw, this feature is present also in Oracle JDeveloper. I would also enjoy a possibility to display only the selected scope (at least a method, but better also an inner code block). Or to make other code outside of the selected scope gray/transparent/not bold. It would really help for better orientation in a wild code :-) This maybe would be a new feature request.