> and resource hogging
Memory usage used to be a major complaint (possibly the biggest) even if it was made clear repeatedly that the OS was simply keeping more stuff in RAM instead of dumping it to disk specifically to improve performance. A mechanism that stuck to these days. That memory isn't marked that obviously in the Task Manager now, and memory is is no longer such a luxury so people don't complain anymore. But on my 16GB machine I have 4.1GB in use clearly marked on the graph, and another 7.5GB cached that is not at all made to jump at people. People want the added goodies and expect absolutely no impact on anything else.
When XP was launched we heard the same grumbles. XP was bloated, had higher resource usage than 98/2000, less stable than 2000, not compatible with a lot of hardware, weird GUI. By SP3 people were loving it and by the time Win 7 arrived nobody wanted to let go of XP. Win 7 was bloated, had higher resource usage than XP, less stable than XP, not compatible with a lot of hardware, weird GUI. By SP2 people were loving it and by the time Win 10 came along nobody wanted to let go of Win 7. And no, it's not an issue of OS quality going down. Like you said, people just get used to stuff and can't take change and when you combine it with the lack of understanding you get all kinds complaints.
Reminds me of an anecdote about a certain car made for the low end market, targeting a segment of owners of 20+ year old clunkers. Everyone would buy it and complain that the fuel consumption was huge. Strangely enough this was a modern engine, certainly more efficient than the old ones it was replacing. The problem? The fancy computer was showing instantaneous fuel consumption. When accelerating? 25 liters/100Km. Outrageous! The company just hid the instantaneous counter and left only the very reasonable average. Problem solved. Then there were the "I can't feel the road with this power steering" complaints which worked themselves out, although to this day there are people who swear the old cars were better (they were most definitely not).
Between lack of knowledge, nostalgia goggles, unreasonable expectations ("all of it, for free"), and a few more things these popular opinions of tech of the past aren't all that useful. It says a lot about the commercial success of a product, not its actual qualities.