There was a feature that IntelliJ added maybe 8 months ago, where if you were in a method, you could click on a particular variable, then hold the Alt key and use the scroll-wheel of the mouse to jump through all the occurrences of this variable in that scope. I found this feature very useful, when analyzing large blocks of legacy code. It appears one of the more recent releases of IntelliJ IDEA broke this feature. (Or maybe it was moved to another shortcut?)