That's probably the main one, really. DrRacket really isn't a bad IDE -- it's not up to Emacs levels of programmable madness, but its keybindings are clearly in

That's probably the main one, really. DrRacket really isn't a bad IDE -- it's not up to Emacs levels of programmable madness, but its keybindings are clearly inspired by Emacs and it has a lot of Lisp-aware functionality. But, its syntax highlighting engine seems to be very slow and hard to really turn off. If you are an Emacs fan, you can use it for Racket instead of DrRacket using Geiser and Quack, which might solve a lot of problems. (I've never tried it -- I'm comfortable with Emacs, but I've never loved the way it handles prose rather than code.)