Most people will just install or use the apps they like or are most comfortable using.
I have a load of crap added by Orange on my current cheap as chips San Diego. I ignore or disable the useless stuff (Orange Wednesdays is the only Orange app that gets any regular use) and just use the features I like. Surely most people do this?
It's a much more homogeneous experience on iPhones I'm sure, but being tied into Apple's walled garden doesn't appeal.
I still don't know anyone that has a Windows phone, apart from the ones on the adverts (Holly Willoughby and that big lad out of Gavin and Stacy). I'm sure they're fantastic.