If we have a action method in our controller and we want to create a corresponding GSP we can press Alt+Enter when the cursor is on the action method. IDEA shows the intention actions and one of them is Create view (GSP page).
We select this option and IntelliJ IDEA creates a view with the name of our action in the directory grails-app/views/{controllerName}
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Written with Grails 3.0.10 and IntelliJ IDEA 15.