Since upgrading to Eclipse Galileo (a.k.a. 3.5) I've noticed that there has been a definite lag in plugin developers supporting the latest version.
A couple of examples that have resulted in me keeping a parallel Ganymede (3.4) version installed include:
- Google App Engine
- Spring Tool Suite (well, not really, as I uninstalled this once I saw the recommended configuration tweaks to get the plugins to play nicely with OSGi)
Today I noticed that SpringSource have blogged and tweeted about an impending milestone 1 release of Eclipse Groovy Tools, still tied to 3.4 but with the assurance that 3.5 support will be available soon.