I honestly don't get why they'd make the trackpad bigger. It's one of 99 reasons for which I won't buy these new models.

I do too, but over the last few days have trained myself not to rest on the trackpad and to find the little 'lip' region between keyboard and trackpad to rest on instead. I guess this is a habit thing though, and it can be difficult to break those habits. I do occasionally find myself thumbing the mouse around by accident, but generally don't find it that inconvenient.

I do wish to note that it has been difficult for me to acclimate to the new motionless trackpad and do things like complex hold/drag/click manoeuvres .. this has required a bit of getting used to, but generally I'm not bothered by the bigger trackpad. Just the haptic adjustment felt like user fail for the first few days - I've gotten over it.

A friend and I were testing out the huge trackpad. It fully rejected/ignored my palms, no matter how I typed. Impressive! But it didn't reject his nearly as well.

Conclusion: it depends on the shape of your palm, or the sharpness of the heel of your hand.