Where would they get that data? Users are given no way to voice negative feedback.

If most users are like most non-techies I know, I assure you, they do care. There's just nothing they can do, beyond telling first couple people they encounter that they hate the new UI, and carrying on with their lives. Because what are they going to do? Move 10 years of their e-mail history to Microsoft and IM/phone 500 people about their new address?

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This is, by the way, my fully generic response to "the market shows users like web bloat". No, they don't. They just don't have a choice but to accept it.