Remember how this is the "man-cession"? This means construction and manufacturing. Productivity is up (and not only because people work harder to not lose jobs) due to a well-needed gutting due to having a good excuse. This is some painful creative destruction.
Instead of pouring money out piecemeal, stimulus needs to address the structural issues: modernizing the workforce/education system, rearranging (cut/add) regulations, and useful infrastructure (e.g. not just fixing potholes).