Ionic Creator is great for rapidly putting together an app prototype, and the export facility (which allows you to export your app skeleton so you can pick it up and turn it into a full featured app) is a very nice touch.
The team at Ionic have now added live coding to the mix, which increases the utility of Creator by allowing you to add more complex behaviours, access UI components that aren't available for drag and drop within creator, and even integrate third party MBaaS solutions such as Google's Firebase.
I've only spent a few hours with this latest incarnation of Creator, but one of my favourite features so far is support for specifying Angular directives at a UI component levels - sorting lists just got a whole lot easier. ;)
There's more in this excellent walk through where Matt Kremer builds the obligatory todo app in Creator, leveraging Firebase as a back end.