"Since I am a Java guy and the IDE concepts are defined as being language agnostic and that support for additional languages can be added later, I will compare

"Since I am a Java guy and the IDE concepts are defined as being language agnostic and that support for additional languages can be added later, I will compare the examples using Java code and Eclipse as the IDE." And you end up proving nothing more than Java isn't a dynamic language where everything is available to you all the time without recompiling - and therefore won't really fit into to LightTable very well. The examples in LightTable are not contrived as you call them - people using dynamic programming environments work with instant feedback like this all the time.