My player only took two official visits. Although very familiar with both coaching staffs for many months, he felt he needed to visit to help in the decisison (although already visited one school).
He picked up on some key things that were improtant to him. At one school the entire team hung together like a fraternity, at the other, he didn't meet too many of the team players. He didn't like one school because he felt it was too spread out and too many enrolled (huge lecture classes of 300+) at another school he liked the smaller classroom sizes. At one school the facilities were most likely one of the best in the country, the other school great facilities but in a much smaller town, one school was closer and one was farther away, one offered more than the other. One school's atendance during baseball was more than the other, these things really helped him to determine which would be the best fit, although he will admit that he prefered then in state females to out of state females.
Official visits during football season can be tough. Football season at some schools is very different than baseball season. A player verbally committing without seeing the school before the signing period can withdraw his commitment before signing his NLI, after signing you can't. Most players that committ early and sign early can take their visits anytime they wish within the next year.