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.
Looks like my fix did not work after reboot all slow again even on 6.0.1. When it was quick the fsnotifier was running at 90 - 95% processor util. Back slow again and its maxing out at 10-20%. Wish I could work out whats going on.