A low resolution screen basically mean the desktop workspace will be a bit small for some people especially for those who do a lot of multi-tasking with various windows / programs open at the same time. It's a constant annoyance if you are trying to reference information from various sources at the same time because you will either have to constantly switch between windows or have all / most of the windows display on the screen at the same time, but the windows are not large enough to view all the information you are trying to reference.
Watching 1080p movies on a 1366x768 doesn't really present much of a problem. It is actually better to scale down a movie rather than scale up a movie to a higher resolution screen. There will be small...