The benefit of CIDER (the Clojure Emacs development environment) is that it now has a s-expr based debugger, whereas Cursive's debugger is still call stack base

The benefit of CIDER (the Clojure Emacs development environment) is that it now has a s-expr based debugger, whereas Cursive's debugger is still call stack based. So you can traverse the AST like in any other Lisp debugger and evaluate and manipulate s-exprs as you go.