I am waiting to see what happens when Apple ditches the physical home button, give the next iphone a bigger screen and eventually adds a magical pen to the ipad. I have this
feeling a lot of iOS users will jump off tall buildings cause they just can't handle the change... LOL
I used double clicking all the time to switch between apps on my iphone and ipad. And having a dedicated soft task changer button in ICS on the galaxy nexus really is nice. I can answer a text, whatapp msg, gtalk msg, then flip back to whatever I was doing without needing to hit the home button twice then hit a soft icon of the task I want.
In many ways the way the capacitive and soft buttons on android phones make them easier to use 1 handed than the physical home button on iphones. Clicking that home button 1 handed can be annoying especially if you have to do it twice. The phone can flop around in your hand a bit making it potentially easier to drop. The cap and soft buttons don't need you to put any force on them. Making them easier to use than physical buttons.
Anyhow you don't have to believe anyone here but most of us who tells you the extra buttons are useful have actually use the device for a while now. To say the additional buttons are bad or not useful is like my wife trying my manual car once and never driving it again telling people manual is useless. Which she doesn't because she knows she hasn't driven it enough to know why some of us prefer the extra pedal.