[tareqak]

One feature I can think of jumping to line numbers which come from make or compiler errors.

[chongli]

Vim has that with its quickfix window.

[dllthomas]

For live debugging there's still a need for some way of getting the source locations you're interested in into that quickfix window. Not that there aren't probably plugins &c that do just that, but it doesn't fall out as straightforwardly as parsing build errors.