I have noticed that some of the press release services, even some free ones, have high Google page rankings. If I submit a press release, will I benefit from this and for how long? At the moment I am concentrating on increasing traffic to individual pages of my website. I already use article submissions.
You won't get traffic only by doing press release submissions. As you have done article submission. You have to do some additional work like Social Book Marking General Web directories and Social Networking Sites These factors help to increase traffic for the website