"To Drill, or Not To Drill, there is no question. Whether 'tis nobler on the mats to suffer the bow and arrow chokes of outrageous competition, or to drill against a sea of submissions, and by preparing, prevent them." - William Shakespeare
If you would like to improve your Brazilian Jiu Jitsu game, you should drill as much as possible. The best in the world do it, and you should do.