Sketching is my go-to way of getting thoughts out of my head and onto screen/paper. They are usually very rough and usually only legible to me in the very first instance. But as an idea begins to take shape so too do my sketches.
I never claim to have the best drawing skills, I only need enough to convey meaning, first to myself and then to my peers. Once everyone has a shared understanding they typically get put to one side and we move on.
Not only is it quick to knock out ideas like this, but it also gives others the confidence to join in. You don't need to be fluent in drawing to sketch out ideas and it's important people don't feel obliged to draw a piece of art each time they want to communicate their idea.