I mean obviously you learn about there potentials and what not, but does that boost the recruits interest at all?

no, only gives you more info

It does not give you "recruiting credits" to make a player like you, but is pretty much vital to recruiting to ensure you're getting decent potential in your players.

Think of it this way:  If you're looking at two PFs, both with a starting DEF value of 55,  which one will be a better player in their senior year?  That's what FSS will tell you.

a bit more detail here
an eval visit - scouting trip gives you info on the player - the one player - and also helps some in recruiting - like he sees you or your assistant in the stands, you talk to his dad, his girlfriend, it has a benefit - so long as you dont run off with his girlfriend

FSS is a scouting service - no player contact - no benefit