I find that the thickish side borders disappear very quickly in every day use. I think the side borders on the pixel Xl are much more noticeable for some reason, maybe because of the top/bottom bezels and how uneven the entire front of it looks.
I've grown to accept the notch. Not because I'm used to it, no I'll never get used to it. But mainly because I appreciate the pluses it brings with it. 1) It saves screen space because we have the status bar up there and 2) I take it as a trade off to not having a bottom bezel at all, something not even Samsung can claim.