The rest of the "It'S So LaRgE AnD UndErSpEciFieD" is just FUD. The regulators don't just slap fines, they work with you to get you to comply, and they just want to see that you're putting in the effort instead of messing them about.
I have literally never been surprised by the GDPR. Whenever I thought "surely this is allowed" it was, whenever I thought "this can't be allowed", it wasn't. For everything in the middle, nobody will punish you for an honest mistake.