When you're changing colors... a LOT... don't you hate getting tangled up in your yarn? The only thing worse is weaving in ends (but we won't go there). But it doesn't have to be an inevitable part of colorwork.
So let me show you what I do. It keeps those yarn strands completely untangled, and once you get the hang of it, it's faster than dropping your unused yarn after every color change. Winning.
I only do it this way when I'm changing colors literally every stitch - like certain rounds of my Disc or Old School Beanie. It gets a little trickier if you try to make it work with longer color sections. And I haven't tried it with more than one color. But give it a try to see if you can work it.