I am moving from JBuilder to IDEA. I find IDEA has a lot of nice features, but also that it lacks some.
The JBuilder feature that I most lack in IDEA is SyncEdit. Simply select any part of the text (code, XML, HTML) and enter SyncEdit mode. Then all occurancies of any word (either it is class, method or variable name, comment, tag or attribute, string constant content...) will be underscored (or marked somehow). When editing a word while in SyncEdit mode, all occurrancies of that word change simultaneosly.
I find this feature simple and a great time saviour. It is much more powerfull then IDEA's Live Templates. It makes Live Template from any part of the code, markup or plain text!
This could be implemented in IDEA too by enabling users to enter LiveTemplate mode from any text selection, marking the occurancies of the words and enabling simultaneous editing.