Here's an article that explains it. It is pretty well understood now that both draw and follow cause the cut angle to increase because they both reduce the amount of throw, but many people still don't know about the results.
http://www.sfbilliards.com/articles/2006-05.pdf
It's better to not call draw and follow "English." Many people feel that the term English should only be applied to side spin shots (and thus some of the confusion here). To be completely clear, I think it is better to say "side spin" and "follow" and "draw" when referring to spin on the cue ball to avoid the wording problem entirely.