I guess I'll chime in since I'm one of the perpetrators...
I don't have a fit with a POV character's eyes widen... but I will notice it every time, and if I'm noticing things it means I've been kicked out of the story.
Ah, but why did I notice it? I can't explain that easily, so let me give you a parallel example from another story here (slightly paraphrased for brevity)
not naming names wrote:Helga's nostrils flared
Yes, you know when your nostrils flare - and sure you can even perceive it, should the nostrils in question be of sufficient diameter. However, I must ask if you've ever seen a beautiful member of the opposite gender and thought "Boy are my nostrils flaring!". If the POV character points out his reaction (be it nostrils or eyes, a tapping boot, or a ruptured spleen) I'll tend to zero in on that, which might not be the writer's intent.
But fear not... plenty of writers use this device. Remember Pippi Longstockings? IIRC her hair adjusts position depending on her level of excitement. Doesn't seem to have dented her book sales.