I try to use people's name but don't always do it. Mostly depends on the situation. If there is little time to type, chances are I'll abbreviate, call you by your class or give you a nickname.
Also, if you have a long name and or something that I find to be taxing, odds are that I'll just type the first 3-4 letters at best. I've yet to have any complaints. If no one complains, I keep doing what I'm doing.