I enjoy coffee many ways. I often drink it black, but I also have been known to have it with unsweetened soy milk and usually agave/maple syrup in addition to that. However, I noticed that using both soy and a sweetener makes it taste kinda "overwhelming." This morning, I put some agave in my coffee but I put no soy, and it tastes much better. Bottom line is that I can enjoy coffee either black or with sweetener OR milk/creamer, but I can't do both sweetener and milk/creamer. Now, that I can't get with.
Its just paper cones/disks. Whatever metal or plastic mesh you might be using must have had an environmental impact being mined and manufactured. What the equivalent is in biodegradable paper disks might be hard to calculate, but if whatever you are using right now amounts to like 7 years of paper like it is for plastic bags well, the decision is yours. Some people also reuse paper filters a few times.