I like the plugin concept not only for adding stuff but also for NOT
adding stuff and keeping my idea as lightweight as possible :)
For example, after i download a new build, I remove the starteam and
tomcat plugins (and add the one i use instead).
Another piece of functionality I am not using is integration with Glue.
As an intergation with an external product IMO it should be delivered as
a plugin, not something that IDEA is required to load.