Yeah, there's a lot of that going on, and it takes different forms.
For example, the show pans across this frame in the middle of a conversation for 15 seconds. There's one bit of animation where Senketsu looks at the pajamas for a moment. I'm surprised it didn't jump out at me that much when I was watching it.
They're also experimenting with some kind of animation software (Flash? I dunno), because I'm not sure why you'd intentionally have ghosting like this on the teacher's shirt if you were hand-animating it.
But they're generally being pretty smart about where they're using it. It's rarely stuff I notice in the moment, and it's almost never distracting. If shortcuts like these allow them to create something this dynamic and fast-paced across 26 episodes, then I don't have any complaints. The effect is more important than the process.