How do I get the best parts from a video?
Racingfail did a video on how they cut the best parts of racing from other contributers: 
                
            
The general idea is the same as you have, but instead of seeing it at 2x, they do it at 16x.

Personally I use Davinci Resolve to skip though the video, with skipping 1 second ahead (shift+right), I see the stuff at ~30x. But any NLE has that functionality so go ahead!

If it's a recording you created, you might want to look at the waveform of the sound, if it's loud it's worth checking out (doesn't work if you have music going at the same time though)