I don't have a problem with Google Drive. I write a lot, and I use drive CONSTANTLY. I love the offline features too. But, I like a notepad app. I like the style, UI, and simplicity of just taking notes. Yes, you can easily open drive and do a word (forgot what google calls it) document and save it, sync it, and organize it better. But sometimes it's nice just to use notes for quick and easy reference and widgets.
I did find the name of the old note app I used to use. "Color Note" it has syncing too. Haven't tried it since my SII but my give it a spin again. I wasn't aware that Drive lets you take what you wrote and turn it into a checklist too. That's pretty cool. Actually I have one beef with Drive and that's the issue of Google Docs and Drive not being fully merged. I've had people send me stuff in Google Docs and then it goes over to drive or sometimes stays in Google Docs. I never used Google Docs so I'm not familiar with it. I'd rather Google just merge the two. It would be nice to have Google Keep be in Drive as well. But keep the keep features.
Basic point is Keep is simplistic, like the card ui, and it works. I'm really surprised iPhone doesn't have a keep app. Google has almost all their apps on iOS and sometimes they get features early (like hangouts and google+) that android gets later.