I'm both mildly annoyed and strongly in favor of them, since they have taught me how incredibly pervasive website tracking of my personal data is. If a website tracks me, I want to know about it, and I want to be reminded to consider whether the website provides value worth giving up my privacy for.

Besides, recent iterations of the cookie banner are (supposed to be) more than just an ok button - they are supposed to provide an opt out mechanism for all non-required tracking. See, for an example, theguardian.com