OK ... and now I just remembered of the opposite case. It was me on the wrong end. Basically I was up to someone and he raised as usual, I called and hit middle pair and then he hesitated for about (slightly less then) a second before cbet-ing hard ... I did notice that something is unusual, figured that to be a good sign and lost all to his flopped set.

Only then did I realize: "Of course! How stupid I was. Most of the time he's supposed to have [censored]. And sudden change should actually mean that this time he has something."

I dunno, maybe it's just few hands like above that made me give some extra attention to this (that is certainly not on the top 10 list).