I moved off the IntelliJ GWT plugin last year for this very eventuality. I used maven and my own custom cli do to all the things that the plugin did (like generating boilerplate).
It was still nice when it recognized if I missed inheriting a module and and my components in UiBinder files, but the plugin never worked really well.
I will now check out the Eclipse and the Eclipse GWT plugin, but ultimately because GWT is niche you have to rely and understand your own tools.