Even EU government websites have horrible intrusive cookie banners. You can't blame ad companies, there are no ads on most sites
But yes, perhaps they should have worked with e.g. Mozilla to develop some kind of standard browser interface for this.
The main reason they need the banner is because they show you full page popups to ask you to take surveys about unrelated topics like climate action. They need consent to track whether or not you've taken these surveys
Their banner is just as bad as any other I have seen, it covers most of the page and doesn't go away until I click yes. If you're trying to opt out of cookies on other sites, that's probably why it takes you longer (just don't do that).
A website that sticks to being a website does not need cookie banners.
Are there any websites that don't require these banners?
If you allow users to set font size or language you need a banner btw
It's usually a click or two to "reject all" or similar with serious organisations. Some german corporations are nasty and conflate paywall and data collection and processing consent.