Depends on when in February as weekend events at the World fluctuate attendance at the parks. Early February should be fine as the only big events are the usual Dance/Cheerleading events that happen during the weekends. Usually the value resorts (All Stars/Pop Century) are sold out during the weekends so prepare accordingly. The midweek though is not as bad as most of the families traveling for these competitions leave one or two days after competitions end. Late February has the Disney Princess Half Marathon so that weekend is more packed than usual. However, the entire Presidents week will be packed with families out from school so avoid this entire week if possible.
There is a sweet spot usually the first or last week of February which you will find low-moderate crowds. Also, weather is slightly better.