As we are working on a documentary this semester, there are bound to be interviews. CMD+T (Title) was helpful for me to add titles quickly to each and every interviewee in our documentary.
CMD+A (Select All) allowed me to easily select all the videos in my sequence for easy navigation and moving them around to suit my needs, and without ruining what I already put together.
As we used both a DSLR and EX3 for our documentary, M (Marker) allowed me to add markers to my video clips and significantly eased the process of syncing my audio and video together.