It's interesting. I started out dead against lanyards not very long ago, got my Sebenza and actually found it rather useful, became tired of that specific lanyard for a few reasons and took it off, and started thinking about what makes a lanyard desirable versus undesirable for me which prompted the starting of this thread. Last night I actually broke down and ordered a little paracord and a hinderer bead. I think I can find the right balance between the additional utility I want (ease of retrieval and even just a small space to tie/hang/clip on anything I may need) and a fairly nice simple look.
I think what finally sold it for me was, oddly enough, not a knife at all, but my sunglasses. I keep croakies on my sunglasses at all times. By far their greatest utility comes from boating, being in or around the water, or just in situations where there is no convenient or safe place to store your sunglasses other than on your person. They may not be universally necessary, but their specific utility and overall neutrality outweighs most of the cons they could have for me. I think for me a well done lanyard may be useful enough often enough that if executed in such a way that it isn't a negative the rest of the time the potential gain makes it worthwhile. I know that may be far too much OCD consideration of a relatively minor thing, but this seems to be a rather divisive question and that generally leads to interesting points on both sides.