I become more and more critical. I was going through a shoot just before and became fully aware that what I was deleting were shots I'd be very happy with not that long ago. But these days not much makes the cut.
If I'm birding and it doesn't have that sharpness or the wings are not in the right position, or the bird looks into the wrong direction it's a goner. If I take 200 shots, if 20 of those survive it has been a good day. And of those twenty, there are often multiple of one bird of which I only select the best.
I got a 1TB drive and that won't be full within my life-time.
I find myself doing exactly the same. Very few of my shots these days survive the cut because I have become more aware of whats possible and more critical of the tiniest flaws, in prior years they would have been keepers.