Yes - later they did it into some cities in Poland.
Carpet bombing was useful tactic, especially into Japan.
Bombers won war on pacific - Japan lost almost all industry and they have no possibility to rebuild it.
Into Europe carpet bombing has not been so useful due to different contructions of houses (more steel less wood). But it helped a lot - Germans had to leave thousands of fighters into Germany instead of sending it on front. Furthermore they had to help people who lost their homes and they wer forced to move most of their facilities on the east.
All in all - it was simply good job.