Try spotting the difference of just one or two characters between the edit and browse windows, and you will just love this feature. Just turn on compare, and the Editor's Choice will do it for you, both faster and more accurately.
It didn't take us long to realize that this is not very useful unless you can roll both edit and browse windows simultaneously, so turn on Track as well, and a single press of Page-Up and both windows will roll together.
In case you have been using a tool that places the If/Do level in the C-spec comment section, compare can operate on a specified column range, e.g.: 7 thru 59 for RPG III.