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Mail security non-expert here, is this going to affect people who use alternative addresses for their Gmail account?

It affected my google workspace account

Do you know if it’ll affect my (personal) account? I run everything through a normal Gmail account and have forwarding for incoming email and an alias for outgoing stuff

It shouldn't affect you. DMARC policies apply to the authenticated domain, which is Gmail.

If you're using Gmail's “Send As” feature to use a different SMTP server for outgoing mail, then yes, you must have a proper DMARC TXT record configured on the domain you send from (even if it's just `v=DMARC1; p=none`).

However, it is worth mentioning that Gmail is fully dropping the ability to use a non-Gmail SMTP server as of January: https://support.google.com/mail/answer/22370.

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