Yes, the most "funny" ones are the ones which pretend you can decline/configure the tracking but only sets you on a long chain of "configure here" links until you end up in a dead end. Or they let you configure non-essential tracking but the essential tracking you can not switch off contains all the worst tracking sites and is definitely not essential for the technical operation of the site... Also this site tend to have over 100 different trackers which is totally insane.
And they probably don't handle the case where you have instructed your browser to not accept any cookies - that is at least an option lynx gives me and an option I seem to remember from my youth in Netscape.
The first one isn't what you think it is. It is, AFAIK, only for complaints against EU institutions. For everything else (national, local, private and non profit entities) you need to contact the relevant national data protection authority
You only need to know who your own regulator is for the country you live in. You file complaints to your regulator, and they collaborate with the regulator for the country where the company is established. This is called the "One-Stop Shop Mechanism" for GDPR: both consumers and companies only have one regulator to contact.
GDPR is actually quite clear and logical on the notion of consent. Implicit consent is implied for anything essential for a service, everything else has to be opt-in.
And while "dark patterns" (making it difficult to opt-out of tracking) might frustrate some, this practice won't help offenders before a court. GDPR isn't tied to any one mechanism (such as cookies) but for collecting PII of any kind; required. free consent can legally only be given if the instructions and consequences are clear.