On the Keurig tangent:
I currently have three different means of brewing single-cup coffee: an Aeropress, a pour-over cone, and a Keurig. Guess which one I use every day?
The speed (my Keurig has an auto-on/off timer), convenience, and above all the lack of mess (coffee grounds all over the sink and counter is a huge annoyance to me), all keep me coming back to the Keurig.
As for the oft-cited downsides, I found that the difference wasn't as night & day as many people assume. First, it takes significantly more coffee to make a decent cup with any of the other single-cup methods. Maybe I have expensive tastes, but I found that if I buy coffee that I actually like, and use enough of it to taste right in a press or a pour-over, it works out to only a little bit cheaper than the K-cups. And since I'm back in an apartment now, all of that extra coffee plus the filter goes into the same garbage can as the k-cups.