Playing any game without vibration is alien to me, since I've been using them since 1999/2000. I used to play an online PS2 shooter called Socom (and its sequals), and I eventually ended up with a dodgy PS2 that disabled vibration. Long story short, my aim was so horrible without it. I was a great shot normally, but without the vibration it just felt like I was over swaying my crosshair and that there was no drag. Recoil was also weird, I just hated it.

As soon as I got a new PS2 and vibration back my skill was exponentially higher.

tl;dr could never go back to non-vibration. It sucks.