Yeah I do it exactly the same. I stare at the centre knurling, or at least visualize it lol. I find it a lot easier to pump myself up when the bar is eye level in a squat rack than on the floor for DL's. Then I close my eyes and concentrate on the lift, run through it a couple of times in my head feeling each individual muscle contract. By then my heart is starting to pump, my breathing speeds up, and I'm in the zone.
But that only works for lifting. Trying to figure out something for playing rugby still. Maybe a pump up before scrums kinda thing (I'm a prop if anyone plays rugby).