'Follow me to' is used to redirect your calls to another extension that you are temporarily sharing.
The calls are presented with your user name so that they can be distinguished from calls for the extension's normal user. This allows you to share another person's phone without logging them off their phone.
All calls are redirected and the calls are still subject to all your user settings as if they were ringing at your phone.
'Follow me to' is the used to enable 'follow me' from your own phone.
'Follow me here' is used to enable 'follow me' at the extension to which you want your calls redirected.