Out of interest, do you not often find this a problem these days? I feel like there'd be a lot of sites out there that are non-functional or literally do nothing without JS.
Gotta say, though, that I don’t think one actually misses much in such cases.
Of sites that require JS to not be blank and don’t fit into this main category, my vague feeling is that the rate hasn’t changed much.
In any case it's not a great look if they want to encourage adoption of their tools!