I used emacs for a year and a quarter as a common lisp developer. There was an integration into emacs from the compiler that provided support for a lot of thin

I used emacs for a year and a quarter as a common lisp developer. There was an integration into emacs from the compiler that provided support for a lot of things like jumping definitions and seeing who calls, and it was much better than the IDE IMO, in that syntax highlighting worked correctly for one, along with the ability to use multiple buffers and windows. I used it as my main place of development while I worked at that company, and it was a pretty great pleasure minus a few issues. I never tried using SLIME because our lisp didn't seem to automatically support having project files being loaded into it, but I probably would have had I stayed too much longer.