Eclipse was an impediment (in Scrum parlance) to our project
But probably a very minor one compared to the languages people use Eclispe to write.
A bit of scouring around and I found some configuration settings to speed up Netbeans's garbage collection & buffers. Made it pretty snappy on my mac. Now that's once it's loaded and I'm editing; other times can still be slow.
But it was a happy switch from Eclipse. Netbeans took longer to do things, but it didn't require that I try doing them 3-4 times before anything would happen (e.g. start/restart tomcat).