Soft High Pitch Whine Heard From Power Brick: Cause of Concern?

That depends on whether the noise is caused by (coil) resonance or a leaking capacitor (these can also resonate). The former is harmless, but the latter can be problematic in the long run, presuming the adapter will be stressed. Finding out which it is is a bit difficult without opening it up, which in itself is a bit of a pain, too ... Chances are good it's merely resonance, since that's a rather common by-effect of using high-power components in very small packages, necessitated by a laptop adapter's small form-factor.

Have a slim 120W adapter that made a high-pitched whine under load. It annoyed me somewhat, so opened it up and replaced the culprit with a higher rated model, solving the problem:

Could buy a new adapter of course, but there's a chance that one too will be audible since resonance is not a technical malfunction per se, merely a by-product. Replacement parts are cheap, usually less than $1, so soldering is a nice solution even in case of leaking capacitors. Could also pad/embed the noisy component with silicone, which is exactly what that white goo is for (also silicone, non-coincidentally).

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Soft High Pitch Whine Heard From Power Brick: Cause of Concern?