Saturdays are always crowded, no matter what, year round.
Sundays are less so, especially in the mornings.
A good barometer is to look at the park hours. When DL doesn't open until 9 or 10am, you can expect relatively low crowds. When DL's hours are 8am-midnight, you can expect mobs of people.
I was there last Wednesday...it was packed. We plan to go this Sunday as well. Hopefully, it won't be too bad. Weather is looking to be REALLY nice, though, and that brings out us locals.