Which language is "nicest" probably comes down to experience and personal preference. For me Lisp's feel a little dense, and I find that I have to concentrate more than usual when working with e.g. Clojure. But this may not have anything to do with blindness in particular; I grew up with Python and various C-style languages and those feel the most comfortable to me. I know some very capable blind Lisp developers and their experience is probably opposite to mine.
My experience with Lisp and Scheme is that after a bit the brackets sort of become invisible for you, but that is of course for a sighted user - does a screen reader say open bracket close bracket or anything like that? Because I think that would add to the density.
It does, yes, but with Braille I suppose the effect could become similar eventually. Actually, I find myself ignoring certain speech patterns in a similar way. For example the word "blank" which is what my screen reader says whenever encountering a blank line. I have long since stopped thinking of the word blank in those situations. It's just a sound that means that there is an empty line. I guess I would eventually stop thinking of brackets as brackets but rather just signals for grouping certain expressions, and the scope and context of those expressions would sort of come automatically much like blocks in other programming languages.
