you do not have to do anything special to use ABS, just brake. Without ABS if you do not release the brake when the wheels lock you cannot turn anymore, and it brakes not as good as if the wheel were not blocked.
And I find it is useful even on wet road, not only when there is snow...
I already avoided one or two accidents that I could maybe not avoid if the ABS did not work (which is lucky, as the ABS on my car sometimes disconnects... )