Well thats fucking dumb, gaper day is april 1st.
Also, how is it a waste? If it dumps you obviously go ski pow, you dont train the park in 80s clothing. And if the skiing is good, whats wrong with dressing up?
And "really good skiing" is subjective but i've been to whistler in april, it rains at the base and the snow is concrete up top, don't kid yourself.