I have the runtime engine installed. Mainly I was just annoyed by the stupid tray icon that kept popping up
and then staying there every time I used a Java app. It was an unreasonable annoyance, given that I can just turn that off (which I've done since loading the extension).
In terms of Java as a development platform, I have absolutely nothing against it. In fact, I am actually very happy that C# is so close to Java, because it means I can read incredibly awesome Java books like
Head First Design Patterns and all the code samples make perfect sense.