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Perhaps the parallel, not too far apart shores (a few kms compared to 10's of kms of length) allows for the formation of standing waves more easily. In addtion, the steepish sides allow for vantage points above and looking down on the lake. This gives the sky reflecting silver blue surface of the lake (like mercury). Then when a standing wave forms you get black 'humps'. Often 3 in a row and they will sit there for many minutes at a time. They are exactly what is frequently described in ogopogo sightings.
Just the other day I came across a prog on Nessie making the same point; they showed footage of the standing waves that can appear in the loch, and they do look exactly like a sequence of humps.
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