Is four and a half month's pay considered massive in the US? What do you normally get when you're made redundant?
its certainly not "massive"
Yes, it is considered generous here. I have been laid off or taken a voluntary severance 3 times and never got anywhere near 5 months.
Id say 2 months is about normal for non tech maybe 3.5 at solid companies. This also adds a week per year at the company so plenty of people will be getting 5 months+ and $5k on top of that
This site has stats. According to it, 20 weeks is way above average.
https://www.trueup.io/layoffs