Getting technical... me likes. I have the same type of pad I use when planning out a new construction project. I have a scale drawing of a patio/burn pit I hope to start on this winter around here somewhere...
I have a few pads of different sizes and I usually go through each size at a different stage of the planning ending with the size above for final somewhat scaled drawings. I've got a few pads full of my crazy ideas and the smaller ones are cheaper to essentially doodle ideas on.