Some Anaheim schools will be on Fall break that week, and Halloween will have just been installed so it won't be the slowest week ever, but I don't think it will be terribly crowded either! Probably more so in the evenings with the AP's stop by after work to check out the Halloween decor.
The week before would have been slower, but it will definitely not be super crowded. Halloween is getting much more popular there, like the PP stated, so that will have some impact, but on the weekdays, it should be nice!
We went during that time in 2005 for the 50th and it was wonderful. Weather was nice and not too hot. We didn't have to wait in many lines, and if that maybe 15 to 30 minutes at most. Which is why we're headed back this Oct 1! Less thank 2 weeks to go!
I know this is off topic but holy smokes kids these days sure get an awful lot of time off. I'm only 23 so maybe things are a bit different in the states than Canada but when I went to school we got summers off, a week at easter and a week at christmas. These days I hear about fall break, spring break, thanksgiving break, christmas break, easter break, summer break and long weekend here a long weekend there, lol. Yikes!!! Get back to school so us adults can go to disneyland!