I agree. I always liked the idea of keeping a cute journal or maybe a death note themed thing, but in practice it feels like a chore and it's not that useful. Especially to the point of writing down each day, keeping track of drinking water (why?) and planning meals like in the picture.
The most I do is open the notepad, write something that I have to do and save it. It's quick and useful. I think when you do more than this your "efficiency" to "decorating and organizing" is off balance.
I doubt you will be able to keep that up for long anyway. Depending on how easily you get tired of things you'll get sloppy and start writing more compact notes in a week or month.
Like the old high school meme I used to see, it went like this: "when you get a new notebook… Day 1, I'll try to write nicely! Day 2, it's a bit off but alright. Day 3, screw it."