Yep, no real quiet times like back in the day. I know its unfathomable to some but I remember days that we walked on Main Street on a Saturday mid-morning and it was almost like pre-park opening in-park breakfast population. Pretty sparse. Think of times kids are typically in school and that's your best bet. Disney has gotten skilled at filling the dead times so don't expect true emptiness.
Our last parks visit was mid-Sept. 2011. It was a lot busier than I thought it'd be. I'd call it medium not low attendance. But it's all relative. For someone accustomed to summer/holiday crowds you'll feel like its empty. For someone who knows what it's like to be there when its really empty it'll feel like the crowds have descended.
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We, too, were there Sept 28-Oct 6 back in 2011.....and it was THE MOST CROWDED I had ever seen! With the FAWF, the Marathon at night, and MNSSHP is was almost unbearable! Plus it was in the 90's everyday! But still, we'll go whenever we get the chance, and if everybody else feels the same way, then there aren't ever going to be any "slack" times anymore.