I don't really do them in terms of waking up January 1 and having a whole new start on life. But, I do consider small changes that I want to make and a fresh start to committing to them. I like resolutions I can keep. When I was in my 20s, having grown up in a pretty dirty house and never learning to make my bed - I decided that I really wanted to make a regular, daily habit of making my bed. This is a small change. I like how the room looks, etc. Well, 20+ years later I still making my bed every day.
A few years ago it was to no longer leave dirty dishes in the sink (which wasn't a huge problem). Mostly they would sort of pile up for a day because I was avoiding unloading the dishwasher. So, I've been really good on that for a few years now.
I guess, for me, it comes down to a small daily habit as a resolution. I would never keep something like "lose 30 pounds" or "go to the gym every day" or whatever. Big changes require a different mechanism for me.
I have noted that gym membership seems to explode in January and die off again by mid-March.