I used AIM and YIM daily. Now, I don’t even remember the last time I had either one of them installed on my computer. I prefer texting, to be honest. I was 14–16 when I was IMing and, looking back, I did some pretty stupid things. Talking to random people from chat rooms, for instance. I don’t have that kind of time anymore, anyway. I text 2–3 people on a regular basis and that’s all I need.
We have IMing capabilities on our Outlook at work, but I’ve never seen anyone use it. Picking up the phone and dialing their extension seems much more efficient, I think. Talking on the phone is just as “instant” as instant messaging, minus the typing time.