I use cow milk in my coffee and almond milk in my bland cereal of choice. I’m not lactose intolerant, but too much milk definitely feels “heavy”. The almond milk plus some sultanas substitutes nicely and is very cheap. Mostly its not for the taste, it just makes breakfast easy and efficient so I can focus on fancy stuff later in the day.
I still don't drink the stuff, but it's only dawned on me in the last year that there are other reasons, such as environmental concerns or ... actually, I'm not sure. Opening two tabs to Google "oat milk why" and "oat milk why site:reddit.com" now, which conveniently makes this relevant to TFA :)