Great thread. I think the 90s was more a decade of nostalgia generally so there is unlikely to be a 90s tone as such. I reserve the right to be wrong but that's how it felt at the time, as we faced the end of an era and the dawning of a new millenium.
One term I used to hear a lot which I don't so much these days is "chocolate-y" but I think you got them all covered. We can all walk into studios and create the impression we know what we are on about!
edited for my woeful spelling!