Thanks all, folks.  Rich's video helped tremendously.  The a-ha moment was 
the realization that the biggest reason to abstract data access in Java is 
the non-uniform built-in access to data:  accessing fields in objects is 
different from hashmaps which is different from instance access which is 
different from static data.  Clojure's uniformity neatly solves that 
problem.  As I'm getting more familiar with destructuring and Clojure's 
polymorphism, I realize that I was anticipating more of a problem with 
fluid data structures than they turn out to be.

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