We've arrived that very same day for the last three years in a row. It is less crowded than at other times we've been, but each year it seems to get a little more busy. That Sunday and even Monday will be busier then the rest of the week, but we were pretty much able to either get ADR's for the same day or walk into most of the restaurants without any problems. Wait times for all the big attractions aren't bad either. The weather is great (can get chilly at night) but all the decorations will be up and it's gorgeous!!!
Have a great time!!!
I believe Pop Warner arrives that following weekend. We stay through Friday and have never encountered them.