There is one JBuilder/Delphi feature that I miss the most in IDEA; that is Sync-Edit:
Just select part of the code, type a key combination and enter so called sync-edit mode. When in sync-edit mode, all changes to a WORD in the selected text are automaticaly propagated to all occurancies of that word, either it is local variable, paramater, field, method name, string constant, type name etc, or XML tag name, XML attribute name, XML attribute value, etc, when editing XML.
This is simple feature not so 'smart' as most of the IDEA magic, but it is extremely useful.
For me, much more useful then IDEA Live Templates.
Eclipse community asked for this feature to be included in future Eclipse versions and they included it in the plan for the one of the next releases. IDEA should also.