The Nigeria Immigration Service (NIS), has reviewed its existing re-entry visa policy by issuing a directive abolishing the use of re-entry visas for resident expatriates in Nigeria.

Click the link for further details:http://tombstone-analyst..com/2015/07/nigeria-resident-expatriates-within.html

OK

But will some western countries do that, Nope.
Ur still gonna queue and beg for Visa before given.

They just aligned with what other countries do. Once you fulfill requirements and pay for Residence Permit, there is no need to process seperately a re-entry visa. A legal resident should have automatic reentry during period of residency In Nigeria