If you use vim as your editor for various programming languages, you simply won't want to be without exuberant ctags. The ctags on standard Unix systems is OK and certainly better than nothing, but exuberant ctags is an excellent tool that will save you lots of time. Two major features are 1) the ability to handle a number of different languages like awk, sh, perl, python, C/C++ and Java; 2) the ability to capture definitions of macros and structures. The whole point of these tools is to let you navigate code quickly and it's hard to imagine a better tool than exuberant ctags to use with vim. If you like using vi, it'd be a shame if you didn't get a copy of vim, a much-improved editor over vi.