To note Lior, a very reliable source in Kashrus that is no fan of Cholov Stam – says you can buy black coffee from any coffee shop. And for a place that has CY milk, the milk container is not a problem if it only contains CY milk…obviously.
The issue of lattes when milk is steamed would be quite problematic from C”Y perspective when there are both milks. However, it is rare to make a latte with half and half – so I assume if all regular/non-fat milk is C’Y as in the case of Cedarhurst- the milk steamer would also not be a problem. The various syrups that are used that Cholov Stam are not added when using the steamer to my recollection.
I am chassidish leaning individual and a number of actual chasidim I’ve seen buy coffee from the DD in Cedarhurst. Not saying that is a proof.
The chasidish velt has rabbanim that treat cholov stam as treif…but not all. There are many heimish yidden (including Rabbanim) in Kashrus checking facilities that are cholov stam. They would not do the same for treif (Chas V’shalom – just making a point). As an aside, since Cholov Yisrael is d’rabbanan and (usually) a liquid -anyways there is more leniency in regards to kashering etc. ignoring the mekilim.
The real shaila by milk is treifos, which would make it treif mdoraissa. The issues are usually mitigated by Cholov Yisrael dairies that ensure the cows in the herds are ok. Nonetheless, it is such a strongly accepted practice to consume cholov stam in America that I do not think any major Rabbanim seem to be making a big deal about it.