Yeah the whole "buried at sea" thing really means they dumped him into the ocean along with the rest of the garbage so that there would be no grave site for his followers to make pilgrimages to and enshrine as a monument to the cause.
Yeah I'm not one to rejoice at anyone's death, but like a mad dog, this one needed to be put down. Reap what you sow I guess. Of course muslim extremism will go on no matter what, but hey, it's a symbolic thing I guess.