One big reason I'm returning my Lumia 920 for an iPhone 5. It's not even just the size, it's the weight. It's so much easier to reddit one handed on the iPhone while e.g. feeding the baby.
Kinda like the App Switcher, it's something iOS & the iPhone get a ton of shit for, but in practice I'm so much slower at one-handed navigation without it. That could also be because I'm a lefty, though.