Replacing text with rectangles is a well established graphic technique for wireframes. However, I am having difficulty creating these quickly in Omnigraffle and none of my stencils have these text-replace elements.
¿Anyone know the solution?
The problem with simply creating them individually is design consistency (e.g., alignment, spacing, &c). A better technique would be similar to how tables are used: once the stencil is created, all you have to do to add another row of text would be to drag the shape until another rectangle appears.