Sometimes what actually happens is that people get used to the change and get tired of fighting against. But they still don't like it at all. It's hard to see the difference from outside.
Exactly. Someone might have their leg amputated and complain for a while, then eventually accept it and adapt. This does not mean that having a leg amputated is a good thing.
Not in every case. I want to use firefox because of some plugins. There is pretty much no alternative for them. Given that is was the best choice so far, I get to choose again between something that doesn't do stuff I need, or something that doesn't look the way I'm used to. Staying with previous versions is never an answer due to lack of bugfixes, security updates, etc.
Same mistake ubuntu does sometimes. It's the best in general, but has more and more really annoying changes in my opinion.
You cannot "just switch" in many cases. In some other you'll have to choose between two things you don't like the least. That's not a good outcome.