Eclipse gives you a wealth of tools to do that for Java. It's exceedingly rare for me to plain search (as in Ctrl-F) for anything in source code, I'm sure I go days without it[1].
It goes way beyond "find references" and "go to definition", too. For instance, marking a variable indicates all the usage points near the scroll bar, and ctrl-,/. moves between them. Ctrl-T opens an index of all classes. Ctrl-O has an index of the current file. Shift-Alt-Up/Down selects increasingly large expressions (across lines, as well).
I guess it all sounds trivial, but taken together I navigate within a Java project in an entirely different way than I navigate source code for other languages or unstructured files.
[1] Grep and its ilk are obviously still common tools for things like log files.
It goes way beyond "find references" and "go to definition", too. For instance, marking a variable indicates all the usage points near the scroll bar, and ctrl-,/. moves between them. Ctrl-T opens an index of all classes. Ctrl-O has an index of the current file. Shift-Alt-Up/Down selects increasingly large expressions (across lines, as well).
I guess it all sounds trivial, but taken together I navigate within a Java project in an entirely different way than I navigate source code for other languages or unstructured files.
[1] Grep and its ilk are obviously still common tools for things like log files.