Same here. The larger iPhone got me to switch back. After using Android for the past 2 years, I had forgotten just how polished the iPhone is along with all the apps on the phone.
Admittedly if Google had released a Nexus 5+ at the same $350 price I probably would have stuck with Android. No way I was going to pay a premium price for any of the Android phones I looked at though.
I went iPhone -> Android -> iPhone
For the same reasons I can't imagine myself using Windows again, I can't see myself using android in the near future.