Rocky - you don't say what park you plan on attending.
But, as a rule of thumb, weekends are always busy. Especially true of the Magic Kingdom. Whether it is "slow" season or not MK on the weekends is a madhouse! Locals (like myself) come in droves, and seeing as Disney is offering their Play 4 Days pass to Florida residents, expect big crowds. (Not summertime or Christmas week crowds by any means, but still crowded.)
The other parks are not as bad, but you can never tell.
The best bet is to go, have fun and don't stress over the crowds. Why worry over something you have no control over? Enjoy!