Hahaha I'm definitely one of those. I like to change them often, usually every two or three weeks. I do get used to people's avatars though, and I do get confused when they change them for a day or so. Luckily, since I still "new" here, I still have an adjusting period to get used to people's writing styles, so I look at everyone's names still.
"Tonight I wash my hands of you
You set the bar I could not live up to
Tonight the light is breaking through
So thank you very little and send me postcards from hell"