The below is, of course, just my honest opinion. You are free to disagree if you like:
My opinion is probably against the grain as I originally LEFT iOS for Android because it was just too stale (and still is, IMHO). However, I now have an iPhone 5 for a work phone so I'm getting plenty of experience with both...
Anyways, one cannot deny that iOS is little changed from the original iPhone in that it is just a static app icon grid. Sure, you can make folders now and have a custom background, but compare it to what one can do on Android with a very wide variety of UI enhancements from widgets to themes, and iOS just looks outdated and stale by comparison. In short, Android has just improved and evolved faster than iOS. For those saying "ew, widgets look nasty" look up threads of people posting their screenshots who have put work into making their UI look great, and you'll change your mind.
That being said, I don't know if saying "add widgets" are the cure-all answer. I like what iOS has done with the pull down notification shade, which in a sense acts like a 'widget' itself. I would like to see more work into expanding the capabilities of the notification pull down so that it gives a user a 'quick glance' at all the info that's important to them without having to open each app. This could act as iOS's version of widgets and still leave the app icon grid main screen in place (if people like that).
Someone suggested having the ability to quick reply to a text from the notification screen (something Android already does). That's a great idea.
I'd also like the ability to access quick toggles for functions as turning off/on wifi, bluetooth, and going to airplane mode instead of having to dig through the settings for each toggle. Another potential use of the notification shade, perhaps?
I think that Apple and Google need to kiss and make up, and allow further integration with Google services. I want to be able to click on a weblink in an email and have the choice of opening it Safari and Chrome. However, given that closed system that iOS is, I don't see this happening.
A lot of you on here like the current look of iOS and don't want to further complicate it, which if fine. However, there are a number of users such as myself who outgrew the stale nature of iOS and went to greener pastures (like Android). A revamped iOS that incorporates UI elements that other OS's have done well might help to bring some of them back.