I usually go on either Monday or Friday. Only went once on a Saturday this year and that was enough: almost couldn't park.
We plan on being there this Friday.
Keep in mind that this w/e October 27th at 4:00 pm, the Gunks Climbers Coalition (GCC) will be hosting it's bi-annual BBQ and auction. The event will take place at the Mohonk Preserve Visitor Center. More crowded than usual.