The things you mention aren't "milk" but are essentially flavoured water that can be used where milk might be used - in drinks, on cereal etc. Without being fortified their nutritional value is negligible.
The only benefits in using milk substitutes like this is that you don't drink or use something you consider to be "nasty".
In response to some other answers you have: I would like to see the medical or scientific qualifications of those answering your question and claiming things that, to everyone else, are simply untrue. If doctors told me that milk was unhealthy and advised me not to consume it, I'd listen. But a few vegans? Hardly! People claiming that other adult animals don't drink milk must have led VERY sheltered likes - dogs, cats, pigs, rats, mice, hedgehogs, foxes etc. etc. will all drink milk given the opportunity. I suspect that the vast majority of mammals would drink milk given the chance.
@Louis, when I said "doctors" I didn't mean four examples. I meant either doctors in general (you know, like doctors in general would say smoking was dangerous) or my own doctor advising me that milk was damaging to my health. There have been papers written, with at least input from doctors, claiming that smoking was not dangerous, or that various drugs, now banned, were safe. It's possible to find "papers" claiming just about anything. However, I do not accept that milk IS "necessary". I accept completely that milk (not just cows' milk) is "unnecessary" for the health of adults. So too are apples and tomatoes. But that is NOT the same as their being actually injurious to health which is what some of you folks claim about milk.
If, as I suggested, you give us details of you medical and scientific qualifications (membership of PETA is not the same thing) then I will take what you say more seriously. I am afraid that if you disagree with what I say about adult mammals drinking milk when they have the chance then you are simply mistaken. Have you ever actually seen an animal Louis?
@Sunshine, as I said, I would like you do give us details of your medical and/or scientific qualifications or for you to tell us of YOUR actual experiences on the farms you criticise.
I have NO medical or scientific qualifications at all but I am NOT suggesting something that contradicts what medicine and science tells us. I am NOT making claims that, to most people, are ridiculous.