(25) However, such devices, for instance so-called "cookies", can be a legitimate and useful tool, for example, in analysing the effectiveness of website design and advertising, and in verifying the identity of users engaged in on-line transactions. Where such devices, for instance cookies, are intended for a legitimate purpose, such as to facilitate the provision of information society services, their use should be allowed on condition that users are provided with clear and precise information in accordance with Directive 95/46/EC about the purposes of cookies or similar devices so as to ensure that users are made aware of information being placed on the terminal equipment they are using. Users should have the opportunity to refuse to have a cookie or similar device stored on their terminal equipment. This is particularly important where users other than the original user have access to the terminal equipment and thereby to any data containing privacy-sensitive information stored on such equipment. Information and the right to refuse may be offered once for the use of various devices to be installed on the user's terminal equipment during the same connection and also covering any further use that may be made of those devices during subsequent connections. The methods for giving information, offering a right to refuse or requesting consent should be made as user-friendly as possible. Access to specific website content may still be made conditional on the well-informed acceptance of a cookie or similar device, if it is used for a legitimate purpose.

The rest of the GDPR makes it extremely clear that the goal of the whole thing is not to mandate some specific solution but to force people who run services to allow tracking only with informed consent and to offer options that do not track.

If you are not storing data on your users machines or just do so for legitimate purposes, you should not have a need to ask for a users consent and thus don't have any need a cookie banner.

The issue here is, that many people running websites just don't know what they are storing and how. Just slapping a cookie banner on that bad boy and calling it a day won't work either, because you have to list the purposes of these cookies. If you don't know why your weird wordpress template loads a cookie, maybe it is time to change it (or alternatively: change your profession).