I think it's about average, however, for the entire year. As of Saturday, September 10, the average day at the MK was something like 6.6 on the scale, which we'd round to a 7 anyway.
kimmbagley, here are a couple of pieces of info we used for your dates:
Hotel occupancy rates - International Drive area
Week before "Jersey Week" last year: 74%
Week of "Jersey Week" last year: 86%
Week after "Jersey Week" last year: 79%
Hotel occupancy rates - Lake Buena Vista area
Week before "Jersey Week" last year: 68.6%
Week of "Jersey Week" last year: 71.8%
Week after "Jersey Week" last year: 55.8%
Hours the MK is open the week before your visit: 74
Hours the MK is open the week of your visit: 86
Hours the MK is open the week after your visit: 79
So, for our predictions, we ask something like "What wait times did we observe for similar hotel occupancy and Magic Kingdom hours in the past?" The only two difficult parts to the entire process are (1) figuring out what things to look at, and (2) figuring out how much weight to assign to each thing. That's not trivial, but not terribly difficult.
Again, I wouldn't worry about the crowds, provided you have some idea of what you're doing each day. A 7 crowd level is certainly manageable. I wouldn't worry about it at all.
Sincerely,
Len