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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