This is a misconception due to their legacy wording. In reality its:
Intellij Project = Netbeans Project Group ~ Eclipse Workspace
Intellij Module = Netbeans Project = Eclipse Project
Also the Community Edition of Intellij is everything you need for POJO development. All the core IDE functionality is the same as in the Ultimate edition and the whole core source code is Open Source. Only the plugins contained in the Ultimate edition are not. So you are only paying for closed source plugins, not a closed source IDE.
If you give it a try, you should do it multiple weeks, not just an hour - it’s impossible to judge an IDE in this short amount of time. You can also select Eclipse keybindings and import Eclipse projects, but at least the latter will imho lock you into a bias and hinder exploration of the IDEs goodies…