IIRC they are still shown and working, but normally with small apps it's so fast if you blink you'll miss them. I guess your app is large enough that the loader layout would be visible for a reasonable amount of time. Give it a shot and let me know if it works.
The 30sec load time is a CocoonJS bug and I'm helping Ludei fix it - it's trying to load the entire project on startup, and it doesn't need to. It should only need to load the first layout before the game starts which would make it a lot quicker to display something.