From my editing experience:
For editing:
Color correction! (make everything look amazing

)
Clip changes on the beat of the song (it adds to the effect of the video and the song itself. it may take ages but its worth it in the end)
Twixtor (not sure if it works for Sony Vegas, but its almost like cheating when it comes down to editing to music)
Dont use movie maker

(never)
For animation:
Noooooooo idea......