I'm not that crazy about Christmas anymore either. I enjoyed it more as a kid, since that was usually when I would get all the toys I was lusting after, a couple of weeks off from school, and some food you wouldn't normally get to eat. As an adult, I've come to dislike it.
I'm not crazy about the wastefulness of the season. Christmas cards are ridiculous. Nobody reads them. They are only sent out of a sense of obligation. They are a waste of the paper used to make them and the fuel used to send them. I don't like Christmas lights. People leave them on all night for nobody to see. They're pumping CO2 in the atmosphere for nothing. If you are going to do lights, at least put them on a timer to turn off at midnight. Nobody cares at 3am. People always make too much food for the crowd they actually have and try to send you home with leftovers. Sometimes I'll eat the leftovers, but usually, I just compost them. A lot of people give shitty gifts because they feel obligated to give something. I would rather not get a gift than get a piece of junk that is going to clutter up my life. I also don't want people wasting their hard earned money on what amounts to beads and baubles.
I don't care for the forced family time either. My parents aren't the type of people I would voluntarily spend time with if they weren't my parents. My mom is a drama queen and my dad is always needling me on politics when I've repeatedly asked him to not bring up the subject. My brother in law sucks too. He's always bitching about how he hates his job and life but never does anything to improve it. It's always the union or some politician's fault that he can't get ahead. His cynicism drains my energy. He's also a cheapskate, constantly buying shitty used cars and cheap electronics that need to be replaced every couple of years. He's a union electrician and makes a good wage, but he's never made the connection that if he does some research and spends slightly more on quality products, he won't have to replace them as frequently. I like my wife's parents, but since my brother in law is usually around taking a shit in the punch bowl, it makes spending time with them less pleasant.
I'm not happy about having my routine thrown off either. I usually buy food in specific quantities since I know what will last me for the week. When the holidays are in the middle of the week, it throws off my groove. I either need to figure out how much less I need to buy or eat the excess at a time I wouldn't normally eat it. There's also the pressure to eat the junk food that is ubiquitous this time of year. I like most of that food and have a hard time saying no. I usually end up putting on 5-10 lbs. I can drop it in a few weeks once I get back on my normal routine, but the waist on my pants will be tight until close to February.