Infix notation can be achieved unambiguously if you use LL(1) with
backtracking
...which I didn't want to do.
Pedagogically, it has been immensely valuable to explain to kids that
+ and - aren't some special thing, but are just mere operators -- and
so are string-append and image-overlay and so on.
Plus, there isn't much arithmetic in many Scheme programs, which means
the quantity of actual infix is small.
Infix goes beyond just arithmetic, ruby allows this sort of syntax
some_list.map{...}.filter{...}.map{...}.fold_right{...}
Which I find much more readable than
(fold-right (map (filter (map some_list)))
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