...the week between Christmas and NY is pure evil....

That made me laugh, Goofy_Mom!
You know, that week between Christmas and New Year's is going to be a madhouse for so many reasons. There are all kinds of people free from family holiday obligations, work responsibilities, school schedules, etc., with time on their hands to head to DLR. There will be people armed with wads of money they received as gifts, ready to storm the parks and spend it on souvenirs (or even on Annual Passes!). There will be the lure of the new seasonal decorations in California Adventure (including Cars Land!), drawing people in out of curiosity.
Personally, I would avoid it (especially for a first-time visit) unless I just had to be there for New Year's Eve or something (but I did that once before and don't want to do it again).
Now, that said, I will mention (just in the interest of fairness) that I have read some other folks' posts here and there, over the last couple of years, which stated that "it wasn't that bad" in the post-Christmas week, and that they were able to successfully get everything done that they needed to do with proper planning and expectations. They also said that the crowds were not as horrendous as they had been told they'd be.
So, there are some people who will tell you that it's possible to go at that time and have a fulfilling, successful trip - but the majority will tell you to avoid it if you can.