In Polish the system is regular (even the exceptions) and nobody considers trying to teach kids not to exploit that. You just remember how each letter sounds and then the dozen of so special combinations (which are still mostly regular). And you can read.
Yes you learn to read slow at first, and then you develop fast reading by yourself, it's natural and comes with reading a lot. I don't know anybody reading sound-by-sound past the age of 10, and usually kids learn to read whole words after they read their first long book (traditionally it's "Kids from Bullerbyn" here).
I wonder how much longer it takes to teach kids reading such complicated writing system like English. Here it takes about 1 year, usually when they are in the first class of school.