your title question is "will micro-stuttering bother me". You answer this question yourself by saying that you notice and are bothered by every tiny frame dip and tearing incidence. Nobody can really tell you if it will or wont, but it is a fair guess to say that you would if you are as sensitive as you describe yourself to be.
You should have titled this thread with the second question, the actual question you ask and do not answer for yourself...
"Does it still afflict us on modern dual card setups?"
That is a much better question. I suggest you edit the thread title and your first post to focus on this.
Unfortunately, I cannot tell you if modern dual card setups have more micro-stuttering then single GPUs.
I can tell you that single GPU microstutter also exists (for different reasons that dual GPU microstutter) and is a real problem in some games/configurations. (it tends to be the result of sloppy coding. commonly found in console ports)
I explained how to impartially measure micro-stutter back in 2008 here:
http://forums.anandtech.com/showthread.php?t=200700
Since then FRAPS actually added a built in micro-stutter detection mechanism (I have no idea what it actually measures and how though).
if people do not post about things they don't know about, how will they ever learn?
What specifically makes you think the OP doesn't know what he is talking about?