There's a helpful piece of software, I think it's like $20, that will help you find the "highlights" in your videos (for example, if you have 10 hours of video and don't want to scan through it all manually.)
It takes a little forethought when filming because you have to put your hand (or something) over the lens when a "highlight" occurs so that the software can go back and find it later on, but it definitely speeds up editing time.
Learn how to find your video highlights with Highlight Hunter
Other than that, I use iMovie for editing.