It’s too little for me. I drink over a pot of coffee a day, mostly decaf, and I use the grounds for compost/fertilizer. It’s too much effort and there’s a lot of plastic waste. I’m not an eco-freak by any stretch, but I don’t like the plastic waste that comes with stuff like this. I’ll stick to grinding and brewing my own.
I use the ones without a plastic covering on the bottom. And for me it’s all about convenience and flavor. At home, the coffee pot is still fine because, like you, I drink a lot of coffee. But for the office the K cup is a hugely better deal for me. And I hated them until I was forced to use them. I’m a big fan now.
BTW, a lot of guys at work use the re-usable filter that you fill yourself.