I still write APL programs. It's a good way to concisely express some algorithms, and helps one think of problems differently. It frees me from one at a time thinking; it's a good language that is truly non-von Neumann in principle, at least for the most part. Read Can Programming Be Liberated from the von Neumann Style? by John Backus. It has modern relevance for the programmers who care about their craft, the hackers.