Having used intellij only recently, as with all ide's there are issues.
But a standout aspect of it, that seems to make it more than worthwhile is its comprehensive intellisense :
A struts page example:
From the struts-config.xml navigate to either the Action or to the jsp page, and then you can navigate to I think literally everything on the page:
jsp page directives (e.g. go to java source)
xsd/dtd in header
jsp/jstl tags (go to tag source)
html (provide correct lists of attributes as hints)
Now, other IDE's have xsd/dtd and some degree of html support, but do not cover the gamut listed above, at least not out of the box or with significant effort at customisation/plug-in discovery.
This is powerful.