My commute is 2+ hours each way (yeah, it's not as bad as it sounds, I'll share more on this in the future), so it's important for me to use this time as productively as possible.
Now I can get through podcasts in 1/2 the time which is great for me.
The amazing thing to me is that I have been an avid iPod/iPhone user for years and listen to a ton of podcasts and never knew this feature existed. I have wasted 100's of hours over the past years listening to people in normal speed. Even though Apple makes great products, they still miss the mark on making feature intuitive or figuring ways to highlight lesser used features.
Am I on my own on this? Have you used this feature?