Honestly, I usually don't notice who I'm talking to.
I see a comment that I find interesting and I respond to it. The identity of who made the comment isn't relevant either in terms of user name or avatar. Often, if I get a PM, I have to go look up the discussion to figure out who the person is and what they're referring to.
There are a few posters I have committed to memory because I find them the most interesting, but, as for most everyone else, people are interchangeable.
I suppose I find people less interesting than ideas. *shrug*
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"If we fail to anticipate the unforeseen or expect the unexpected in a universe of infinite possibilities, we may find ourselves at the mercy of anyone or anything that cannot be programmed, categorized or easily referenced."
-XFG (no longer a moderator)