I think I've figured out why so many people have differing experiences with the Apple Pencil battery life.
First of all, my Apple Pencil drains quickly and it annoys me. I have the UAG case for the 9.7" iPad Pro (awesome case) and it includes a loop for holding the Pencil. I keep my Apple Pencil in the loop at all times, except when I'm using it, obviously.
So... I'm essentially always "moving the Pencil" whenever I'm using the iPad or even just carrying the iPad.
I suspect that some people don't keep their Pencil attached to their case; some do.
To prove this out, I set my Pencil down on my desk and went about using my iPad. Eventually, the Bluetooth icon on the upper right if the iPad case went faint. (I have no other Bluetooth connections besides the Pencil.) I believe that signifies that the Pencil is asleep. Then, I just rolled the Pencil the smallest amount, and that woke it up and the Bluetooth icon on the iPad flashed for a few seconds and went solid black.
What to make of all this? In Apple's quest for the Pencil to always to be ready to use, the slightest bit of movement wakes it up. I suppose Apple didn't assume people might be carrying the Pencil with them, and thus awakening it a lot and keeping it awake for long periods. The official iPad Pro cases from Apple don't provide the means for attaching the Pencil, and the Pencil itself doesn't have any kind of clip on it. Perhaps Apple assumed we'd all be keeping the Pencil in a pencil cup, grabbing it just when we need it. If so, poor assumptions...