When you edit video and film, there are really only a handful of effects needed. And by far, the most used one is dissolve.
Dissolve needs to be super simple to add, click one button, set duration and placement and hit add/apply/ok.
A good example could be the Quick dissolve dialog that Avid MediaComposer has. A simplified version of that would be nice.
For wipes, it would be nice to have the standard wipes in a menu that is easy to pick from. I tried adding a wipe and understood absolutely nothing. I got a little box in the timeline. When I clicked on it, I got a strange interface. All I wanted was a simple wipe... And I need it with as feww clicks as possible.
A video editing system needs to do the basics real fast and real simple. Anything beyond that is just a bonus. :-)