postgres materialized views and indexes to improve aggregate performance
No. How would the query processor recognize that it should use the materialized view.  The materialized view is another object.

See  http://www.postgresql.org/docs/9.4/static/rules-materializedviews.html

In part that explains: "When a materialized view is referenced in a query, the data is returned directly from the materialized view."

So materialized views are useful, but you need to program not only for their maintenance, but also doing the necessary coding to use the materialized view.