Background: In an era marked by the blooming reliance on digital platforms for healthcare consultation, the subreddit r/AskDocs has emerged as a pivotal forum. However, the vast, unstructured nature of forum data presents a formidable challenge; the extraction and meaningful analysis of such data require advanced tools that can navigate the complexities of language and context inherent in user-generated content. Objective: Our objective was to evaluate employing Large Language Models (LLMs) to systematically transform the rich, unstructured textual data from AskDocs into a structured dataset, an approach that aligns more closely with human cognitive processes compared to traditional data extraction methods. Methods: We developed a dataset of Reddit posts from r/AskDocs by extracting key information via human annotators. Then using specially engineered prompts we used state-of-the-art Large Language Models (LLMs) to extract data from posts and compared the results. The variation in the LLMs were further compared to the humans to show similarity. Results: Our findings indicate that LLMs not only match but, in several aspects, surpass even highly educated humans in extracting information, including both demographic and context details, from unstructured texts. Conclusions: This study not only validates the use of LLMs for analyzing digital healthcare communications but also opens new avenues for understanding online behaviors and interactions, signaling a shift towards more sophisticated methodologies in digital research and practice.