In business we use surveys to understand our customers and adjust to better meet their needs.
In church we don't usually do this. At my church we've done a couple, but not regularly.
Every quarter we should do surveys of church services, small groups, Sunday school, youth groups, etc.
They can be quite simple, and for younger people SurveyMonkey can be used: it automates analysis.
Here's a quick example of such a survey: