Yes, there are a lack of non-commercial IDEs for Lisp that are purpose-built and give a great "Out of the Box Experience". However, don't dismiss SLIME due to

Yes, there are a lack of non-commercial IDEs for Lisp that are purpose-built and give a great "Out of the Box Experience". However, don't dismiss SLIME due to emacs. It contains all the nice IDE functions - symbol completion, attaching (and editing!) long running processes, function tracing, stack tracing, find references etc. Access to a REPL in a running system image is an amazing and productive experience.