Going back a few years I can remember that we only did a full run-up on the first flight of the day. For every subsequent flight we just made sure each mag was working. And, horror of horrors, I also remember having to lean the engine on hot days to get the required RPM/MP. As for jets (and turboprops), I've never done a water drain and runups are little more running at a high power setting just before departure to detect and/or shed ice.
PM