For the past 2 years, we have travelled to WDW during our Spring Break which has been the first week of March. I can't speak specifically to the second week...however, the weekdays are less crowded than the weekends. Florida schools are still in session, so the majority of those visiting are on their break too. I believe the National Cheerleading Competition is at WDW March 10-13, so it will be even more crowded than usual. We spent our last day of our trip at Magic Kingdom when the cheerleading competition was starting and it was real crowded. If you go after that weekend, you can probably choose any park. Mondays are traditionally more crowded at Magic Kingdom.