I have experienced very slow project opening times when using 6.0.2. I had the same problem with 6.0.1 but with the help of this article http://blog.jetbrains.com/idea/2010/04/native-file-system-watcher-for-linux/ I was able to improve things considerably.
I switched back to the 6.0.1 version and again it was fast. So I copied the fsnotifier and fsnotifier64 from 6.0.1 bin directory to the 6.0.2 and it was back to the normal speed, seconds rather than minutes.
Hope this helps someone.