[tialaramex]

In WPA3 the nosy neighbours can't sniff anything. If there is no password or they know it they can do an active MITM to get between users and your Access Point because it now uses a PAKE, but active attacks can be detected and would be a bit more than "nosy neighbours". If you use anything fancier than a password (including technologies like EduRoam or GovRoam, Active Directory login, whatever) any adversary has to attack that instead.