I don't want to root mine, either as most of the customization I want is right there on the system already. That being said, then you want to bypass your lockscreen security with the camera; I didn't know you could do that with iPhone since I've never set up a pin, just a slide-to-unlock (which is how I lock my Note 2, too... sounds funny hehe).
The camera on the Note 2 is not that great in low light or indoors, it has a very slow shutter, so it does come out either blurry or noisy, definitely something the iDevices have always handled quite nicely. But in bright light, it is outstanding. IF you're going back to Android, I'd say go for the S4 if features are your thing (and an improved camera, from what I've seen). But if budget is now an issue, get the Note 2 or an S3, as they're sure to drop prices next week.
BTW, you CAN keep you iTunes music/playlists if you use DoubleTwist or Samsung's own app, EasySync (the first is a full-fledged music player whilst the latter only lets you sync music/playlists). In my case I got Spotify and now that crosses over to any device I use.
The one thing you'll always miss is iMessage (I know I missed BBM when I had a (shudders) BlackBerry... I know, I'm not proud). I've never owned an iPhone but I do own an iPod Touch, iPad and my sister has an iPhone, so iMessage can be a big thing. We use Whatsapp, but that's only between phones. I guess you can use GTalk to have communication with a PC, but then your kids would need to set up a GMail account.