Watched again, it felt like the time that passed was.. five minutes, five fucking minutes Denny.
Okay.
I think it's because it's made of just a few very long scenes, so if you get caught up in the story, you won't notice how long they run, only that it was only a few scenes long, but if you don't get caught up in the story, you feel the length.
I found no plot errors this time around, but see everything connected, well-rounded. It's just a very heartfelt story of a civilization finding out about their potential, they have already nearly realized. The leaf, as an embodiment of concentrated negativity, is the final tic with all the positivity it can create, when channeled correctly. I like to think there weren't nights before with the planet, plus sun, but now there are. The planet just let them take the easy way out with its endless light. Or less symbolically, cure-all religion.
I found the Doctor's speech more of a lament about the sunny planet having taken an arrogant position, that it should not only take, but give like everyone else, and the even cooler, more experienced Doctor does. Arrogance led the planet think it can handle anything, and information overload ensued. A good thing to bring up, in a story cherishing experiences and stories.