I would say you are 100% correct - in the Android ecosystem. I am exactly the same; I have a relatively new Nexus 4 and before that I had a Nexus One that I used until it was basically a painful experience because it just kept running out of space.
The N5 is basically the same phone and there's not a lot the Samsungs offer that interest me.
But Apple has a different model - they don't have thousands of different options. It's just one new model every couple years. They have a prestige associated with the iPhone that has almost
Most of the people I know who live in the iPhone world are largely non-technical types. With few exceptions they all want to be on the latest version - baffling to me as someone that actually looks at features.
Maybe this will taper off but so far I think Apple are just killing it.