> Many Lisp traditionalists are bothered by the use of curly braces for maps and square brackets for vectors, however I'm a fan. Without this bit of syntax, you have to add verbosity to the language to differentiate defining a map from doing a lookup, etc.

I agree with you, in the sense that they are useful, however the complain of "Lisp traditionalists" will be that in any case, if you need them, you can add them to Common Lisp by using reader macros. So in CL the curly braces and brackets are "free" to be used (i.e. define what they should do) in any way you want; on Clojure they are already taken, so it feels a bit uncomfortable.