In android it just a single back button away, or if something goes wrong, when I return to email I'll be where I was before, correctly scrolled in the email I was reading.
I miss android!
Hope it helps, you can show your friends and bathe in the satisfaction of knowledge sharing. Also on iPad, 4 finger swipe to move between apps, 4 fingers up to show App Tray, full page pinch for home. Not hidden by any stretch, but not widely known.
When I already have a home button, why should the back button be used more for home (besides the actions in the app) rather than "up" a level to a previous state like it's supposed to?
Someone starting out with jellybean as their first touch OS would have few problems... at least if apps actually followed the guidelines. >_>