Every world champion except Botvinnik excelled at blitz chess. Capa, Alekhine, Tal, Petrosian, Fischer, Karpov, Kasparov were all great blitz players.
But the internet age has really made a huge difference for blitz players. Today's players have really refined the art form.
Nakamura is one of the greatest blitz players ever. A few years ago, he and Carlsen sat down and played a long blitz match (something like 40 games). Carlsen won that match.
For me, Carlsen's the greatest blitz player ever.
That answer may change in the next few years.
I agree. It is no surprise that the best chess player in the world currently, also happens to be the best blitz player too.
Bronstein said once he guessed Botvinnik could be a great blitz player since his play was always very strong under serious time pressure (I assume he suspected Botvinnik probably practiced it in secret), but his elitism did lead him to condemn this form of the game.
Carlsen is very poor and weak blitz player. If he were born 40 years ago he wouldnt be able to get in the top 10 of the USSR championship.