I don't think a simple Christmas is a myth, but I think in this day it is something that requires some focus and determination to achieve.
That being said, if you mean "simplify" as in organize...
*You could make a weekly to do list. Set up times for shopping, baking, etc. Make the lists on your computer and save them so you can use them (and easily revise them) each year.
*I try to make at least O. batch of cookie dough to freeze each week beginning the first week of November. Then right before Christmas I can spend time over a day or two baking.
*I have address labels saved on my computer for those people I send Christmas cards to. After a quick update all I have to do is print them out. I also include a newsletter in our cards. Some people might consider it to be not personal enough, but it is a huge timesaver. If I feel I need to write something more personal I jot a quick note in the card.
*I start shopping for Christmas presents for the kids as early as September at websites like toysrus, kbtoys, amazon, barnesandnoble. I find some great deals throughout the fall.
*I save gift bags from gifts I've received to use at Christmas. I find it much quicker to fill a bag than wrestle with wrapping paper, tape, etc.
*Ultimately, I would love to set up a binder to refer to with my lists, recipes, timelines, etc.
If you mean "simplify" as in finding the "true reason for the season"...
*I make gifts with my kids to show them that we don't have to spend a lot of money. A good gift doesn't have to have an expensive price tag.
*We fill bags with craft items for pediatric cancer patients at a local outpatient clinic. Sometimes the kids have lengthy appointments as they receive blood transfusions or recuperate after a procedure. This helps to fill the time and give them something other to think about than the health issues they are facing.
*We incorporate our spiritualty into our celebrations, our decorations, the holiday movies we watch, the cards we send, etc.
*We set up a modest budget for Christmas presents.
*We talk about how much we enjoy being with family, spending Christmas morning in our pj's, etc - things that aren't lavish but enjoyable and appreciated.
*Something I do without anyone's knowledge is to send a family I know little inexpensive gifts every year. They have been going through some rough times and I thought it would be fun to play Secret Santa. They haven't figured it out yet, and I haven't even been mentioned as a possible suspect, so I must be doing a good job. ;)
Hope you have a wonderful holiday season!