Copy and paste is possibly the simplest of all editorial functions, but there are a few really powerful ways to spice it up.
Here are some tips for Avid Media Composer, Adobe Premiere Pro and FCPX for better copy and paste
A Better Way to Copy and Paste in Media Composer
This 'from the trenches' editing tutorial from editor Brian Thomas' AvidBeer, demonstrates how to copy a section of your timeline - clips, effects, transitions etc. - to the source monitor and then have it paste into the timeline.
This requires a different way to Copy - CTRL+ALT+C - whilst pasting it is the usual command, Ctrl+V.
Brian walks through some of the ways in which he uses this technique all the time, choosing never to use trim mode, instead of this technique.