In Android you swipe apps away from the multitasking menu, been that way for ~2 years. Coincidentally it's the same way in iOS 7.
Don't get too used to those annoying hard to hit red x's because iOS is about to do it like Android does.
Also there are certain background processes Apple doesn't let you see running. If you were able to kill them they'd be back in 5 minutes. Android multitasking is like that now too.
I think you might be referring to Gingerbread maybe?