We're box checkers but I think it's because of the ages of my kids. I really do feel we have to do the basics: spelling, handwriting, phonics, etc. everyday and if I don't have them on lists, they won't get done. I believe language and math have to be done everyday and we're still doing spelling. Other things, like McGuffey readers, also lend themselves to one lesson/day. It's easy to just get them done and check 'em off.
I'm not checking boxes with content. So for science and history, we either get to something or we don't, but we try to stay on a general schedule. I'm much looser here.
I'm planning to be less of a box checker later. When it's all content and not skill (except math) I'm hoping to switch away from detailed checklists and move to more general goals. Ten year olds seem to be trapped in the transition of this process.