Recently I've begun hearing/reading it without the negative: "It's too cold for me anymore" or "All I read is Nora Roberts anymore."

I have heard this usage. A typical example to me would be something like It seems like all we ever do is fight anymore. It expresses a recent trend that is a departure from the way things used to be. Both of the examples you gave fit this pattern. It's too cold for me anymore (but I used to be happy with the climate). All I read is Nora Roberts anymore (but I used to have wider reading interests).