I hit the space bar with my right thumb between N and M most of the times, but also many times with my left thumb between C and V. My spacebar's dust also says I sometimes hit between V and B, I think with boths thumbs.
A bit off topic, but recently I've been to three different doctors (MDs) and I was surprised to see that, even they were kind of proficient typing (not typists, but they used most of their fingers), they hit the space bar with their right index finger. I found it interesting, and I can't guess why.