I've stayed at the Poly several times but the closest I've stayed there was during mother's day week. Last year, we did stay at WL the Saturday before Memorial Day until the Friday after. The parks were more crowded during the actual weekend and then really were less crowded on Tuesday. We did visit the Poly and as always, it has the normal crowds. It will be more crowded near Ohana during breakfast and dinner and in general those times are more crowded at the GCH because of people using the restaurants. But it is not bad at all.