Lately, all of them do. Why not look at the most recent World Championship match for games?
Masters who play QG consistently?

It might be worth looking some older games also. Capablanca-Alekhine wch match featured mostly QG. Rubinstein is always a good player to watch and Lasker's games might also be noteworthy. Karpov - Kasparov matches had many QGs. Actually most masters have played QG at one point or another so there's no shortage of material. Even the devoted e4-player Fischer played several QGs in his wch match against Spasky - probably for the first time in his career.
It has been suggested to me that I memorize several master level games. Although I used to play e4 consistently, I have started playing the d4 alot lately and would like to find some good games to memorize with that opening. Are there any masters who consistently start with d4? Any specific games recommended? I would really appreciate any responses.