Well, for me it was never boiled frog syndrome. I was extremely alarmed when this rubbish first started, although I haven't really done much more than start this thread.
I'm also not sure it was quite like that for most other people. If you apply the squeeze and divide-and-rule, people will try to somehow continue with what they're doing in the hope that things will get better from their hard work. This is against the backdrop of a continual and gradual worsening of conditions. The inital ConDem 'cuts' were an absolute scandal (or a series of absolute scandals), compounded by the lies and deception that went along with them, but at the time most people still had some more reserves of resilience and assets. Then some vulnerable people fell by the wayside--committed suicide, froze to death in winter, etc.--, but they were 'just' vulnerable people and politically people like that are almost completely powerless. Then there was little political resistance to all of it--e.g., no councils trying to rebel, etc. and the Tories just carried on with it, because it felt to them as if they could destroy even more with impunity. Again, I'm sure that all of this is to some extent caused by the data political parties now hold on voters (and non-voters), and the fact that people are constantly distracted by the Internet. It's very hard to get any focus on organisation against such goings-on together beyond the occasional polite middle-class protest march. I'm sure lots of people have been aware of the rising temperature for a long time, but have merely felt powerless to do anything much, until they were able to vote for Corbyn, say--but given the relentless attacks he is subjected to, that also seems like a slim hope. Obviously, some people will also have said 'sod this, I'm not waiting for Father Christmas any longer' and adopt more of an 'I'm all right, Jack' attitude, and as I don't harvest anti-social media data, I have no idea how that breaks down, but I think it's harder than ever to effect political change in any other way than at the extremely occasional elections--hence the protest vote at the EU referendum. Etc.
Now you get child poverty increasing again: