Professionally, I have not had to deal with a GDPR request luckily, as we have a lot of anonymized legacy data that is hard to track back to specific participants in our studies.

Personally, I feel the conversation on data in many organizations has helped me feel more secure in my privacy considerations. Although it may not be because of the GDPR, I feel I can make facebook/google/<data_aggregator> accountable about my personal information, if I really wanted to. Although I have not done it yet.