Recruiting is simpler than these sites would have you think, and sites where you self-report measurables are not that helpful, since they need to be verified anyway. My son had a free NCSA site (for which we had to do an hour-long phone interview), and at some point he put up a free Berecruited site, but he didn't ever update them, so his profiles were pretty weak-looking and out of date. I don't think they helped or hurt in any way except that he got more camp invites.
The one time we noticed anything happening based on a website was when he put his SAT scores on the PG website; the next day he got the email from Stanford that many people get - sounds like they are recruiting you, but really they want you to go to their camp.
Agree that coach word of mouth is the most important (after having baseball skills/measurables to begin with).