It has been around for a bit but I finally got to try the Live Edit feature in Intellij IDEA. Live Edit lets you immediately see your UI code changes in the browser.
Setting up Live Edit in IDEA wasn't immediately obvious so here is a quick guide for others:
Install the Live Edit Plugin in Idea via Settings > Plugins > Install Jetbrains plugin:
Click on Debug for that configuration to open your page in Chrome. Now you're ready for Live Edit! Just make code changes and never leave your IDE :) Here is a walkthrough video: