I worked at CP for 5 summers and opening day all depends on the new attraction! In 93 when snake river fall opened of course no one rode it because it was cold and the park was slow to moderate. In 91 and 94, when meanstreak and raptor opened, opening day was a mad house with people standing in lines for hours. So with MF opening,I can bet you that you'd wish you would have waited during the week in may to go!!
Chris