The trick is to set both number, and relative number. You then get line numbers in the side. The line your cursor is on is the absolute line, but above and below them are offsets. Makes jumping up/down lines easy. So the cursor sitting on line 4 of a file looks like this
3 a line
2 another line
1 a third line
4 foo
1 bar
2 bazz
3 fizz buzz
As far as jumping words, I personally feel that it's easy enough to eyeball.
edit: I see that they have the note 'There are line number and relative line number on the left.' in the post.