Is there another method I can use to export my user data for use in MailChimp or similar ??
You can go to the Reports section Report Builder > Create Custom Report to export a list of users.
The following query will give you the users name, id, email address and organization.
SELECT people_emails.person.id, people_emails.date_created, people_emails.person, people_emails.email, people_emails.person.organization.name
WHERE people_emails.date_created = %THIS_MONTH%
You can change the time period under WHERE depending on what users you want to export e.g users that were created THIS_YEAR, LAST_MONTH etc.