I got a Xerox 1108 Lisp Machine running Interlisp-D in 1982 and enjoyed it greatly. It had knowledge of code like modern IDEs making code inspection and refactoring easier. Back then, it was like magic.

Now however, I prefer IntelliJ for Clojure and Java, and the similar IDE RubyMine for Ruby development. I think very good IDEs are a spiritual successor to the wonderful programming environment if my 1108.