I definitely commonly fall into a cyclic productivity setup, though I am not sure if I would call it 'burnout'. I think that burnout is coupled with disgust for the primary activity, while my lows are characterized by low executive function, not quite at odds with disgust but personally I love my work, and I am just not thinking right when I am at my lows.

There doesn't seem to be intrinsically grinding pain to neurotypical behaviors. I say this because for the past couple months I have fixed the productivity highs and lows into a nice marathon pace. I will see how long this pans out of course.