Well 7/4 is on a Sunday this year, so when I refer to the 'week of July 4th,' I'm really talking about the week beginning with 7/4. I think that's when most employers are letting people off, but the fact that some will get off before and some will get off after should help (hopefully) to split the crowds into two weeks.
I was a bit worried bout crowds too, but you've all helped assuage those concerns, so thanks.
As for the fireworks, I've read that between the Grand Floridian and the Polynesian (somewhere on that trail, I guess) is a really good place to view the fireworks. I've never been to it before, though, so I don't know for sure.
Also, what about the California Grill in the Contemporary? Isn't it supposed to be a really good site for this? I'd suggest making Priority Seating pronto, though.
-Aaron