It's really a side effect of the kanban board. See, the more organized I am (or, the more I can write down what I am actually working on), it can go from overwhelmed (but not knowing why) to actually seeing the scope of what I need to do. So, on one hand, it's nice seeing the progress of things across the board, but it's also depressing, because no matter how fast I assemble and prime, painting is a bottleneck. And, no matter how much I assemble, I have hundreds of models to go.
So, I'm keeping the board idea. (What?) Yep. But I might change it up a bit. Maybe I try to schedule and list only one game per week. Maybe I cap the board in its current state, and nothing that is not on it can be added until something comes off. I don't know. I do know that, so long as I make painting and modelling a daily (or almost-daily) activity, then sooner or later, stuff actually does get done.