One of the most frustrating things of Eclipse is the poor support for Maven JEE projects by the Web Tools Plattform (WTP). Especially the incremental deployment, which is a cool feature of Glassfish Server is not supported by wtp. This was the reason why I started a new project with a small Eclipse Plugin to speedup maven based development of JEE apps in Eclipse:
See the manik-hot-deploy project site: http://code.google.com/p/manik-hot-deploy/
If you have any comments ore suggestions about this plugin let me know!