I mainly use the app for making notes in the script margins and highlighting areas that need attention. During table reads I use the freehand drawing tool to make checkmarks next to jokes that get laughs.
I then transfer those checks to the drafts that come out later in the week, so if we’ve only revised the first half and are still working on the second half of a script, say, I have that information available (whereas my coworkers will have to have multiple scripts in front of them or are just relying on memory).
On set, I use Scriptation in place of sides. It enables me to quickly look through older drafts in case there was language we wanted to go back to. I also keep my production meeting notes in the margins of the script and use Scriptation to transfer them when new pages come out.