what do you guys think of doing two sets til failure?

Im fairly new to lifting but i fell in love with the gym instantly. for the first like week i was doing 3-4x12 for everything with light weight until i did research and many say it wasn’t optimal for maximizing muscle growth. ive now been doing 2 working sets of heavy weight and lifting with intensity. i generally cant get more than 8-9 reps most times and if i can then i know i can go heavier. it seems almost nobody in my gym is training hard with less sets and i probably look lazy when im done with the gym in 45 minutes.