With GDPR conform cookie consent popups/banners, managing ones preferences is actually very easy. First time visiting a website just click decline and all is good. Unless of course we are talking about websites, which only pretend to be conforming, but are actually intentionally not. I say intentionally, because it is way more likely, than everyone responsible at a company having lived under a rock for the last ... what? 10 years now? ... and not actually knowing better. Nope, we have widespread shameless blatant violation of the law at our hands.
On my pension provider's website I get the cookie consent warning every time I visit (whether I decline or accept). Even more annoyingly, this happens in the iOS app of the provider (which has a webview).
EU regulations like this are so poorly thought-out. They should have just banned nefarious tracking cookies outright. The EU never seems to understand the practical consequences of their technical regulation.