Comment by nemetroid

If you're a CLI user, you should check out tig, which is a terminal UI for git. In the blame view, you can select a line and press "," to go to the blame view for the parent of the commit blamed for that line.

This lets you quickly traverse through the history of a file. Another good tool for digging into the history is the -S flag to "git log", which finds commits that added or removed a certain string (there's -G that searches for a regex, too).