I just made the switch two weeks ago to an I5 from a Gnex that I have had since release.
Why did I make the switch. Basically it's the iPad Mini to blame. I had a Xoom, and had been wanting to buy a Nexus 7, but after looking around, and playing with the mini at the Apple store, I defected, and bought the mini 😱
I liked the mini so much, that I bought a Mbp... It's like an addiction 😀
I started to build roms on the Mbp for the Gnex, and was liking Osx so much better than Windows (I really like Linux as well) that I was really starting to like Apple. A lot.
So next thing I know, I'm at Verizon buying an I5 😎
So far, I am more than happy. The battery life has been so much better. It really blows me away to be able to use my phone all day, and not worry if I need to plug in to the charger or swap the battery for a spare. I thought my battery life was better than average on my Gnex as well.
The iOS is a little boring compared to Android, but everything works, and works well. No lag, no FC's. It just works.
The size was weird for a day or two, but I have now adapted and like the smaller size and lighter weight. I also like the feel.
I like the screen colors a lot better as well (anyone that has had a Gnex will understand this 😀)
You can download the remote app from the app store to control AppleTV. I have it on the I5 as well as the Mini. It's easy to use and gives a more modern feel than just using the included remote.
Photostream has been pretty cool, but as was stated, I prefer dropbox as well.
I would recommend giving the iPhone a try. I still have my Gnex, and will keep it as I still build roms for it, and may pick up an N4 for dev work (once they become more availble to purchase 🙁 ), but for now, the I5 will be the daily driver for the future, till the next iPhone arrives 😎