A substantial amount of academic sociology is based on quantitative analyses of survey data. For example, here's an (open-access!) paper describing gender divides in US doctoral education: https://www.sociologicalscience.com/articles-v4-6-123/
Also, a lot of survey data captures demographic characteristics, not just individual beliefs-- think censuses. Surveys are generally considered a robust instrument for measuring things (like income, occupation, gender) that are relatively fixed over time.