I don't think the GDPR solves much or anything, iff you want to play on the internet, almost [there are good exceptions, where you can just choose to have a 'lesser' experience] all of the time you'll have to click "I agree".
GDPR does solve some problems, in my view. For example, it allows EU citizens to ask companies to disclose what they know about them and how it is being used. You can ask companies (and they must comply) to delete your records. Data must be pseudonymized / anonymized in many cases. Those are all real effects. It offers transparency and gives more control to individuals.
If you want to learn more about what the GDPR does do, what protection and control it brings EU citizens, I refer you to the wikipedia page which has all of that and more.
https://en.wikipedia.org/wiki/General_Data_Protection_Regula...
That in itself is a GDPR violation. If you care enough, report it. That said, this is not what happens “almost all of the time” at all. In my experience most websites are completely or partially usable when you disagree with being tracked. At worst (and also in violation of GDPR), the tracking dialog makes it intentionally difficult to refuse being tracked.