I'm seeing long-running transactions (pg_dump) canceled on the standby when
there are a lot of inserts happening on the master.  This despite my having
set max_standby_streaming_delay to -1 on the standby.

Why might that happen?

This is pg 9.3.12.  When it happens I see:

pg_dump: Dumping the contents of table "TABLE" failed: PQgetResult() failed.
pg_dump: Error message from server: ERROR:  canceling statement due to
conflict with recovery
DETAIL:  User query might have needed to see row versions that must be
removed.
pg_dump: The command was: COPY public.TABLE (COLUMNS) TO stdout;

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