Dimensions on paper can look very deceiving. For Moto and Samung phones they usually ignore the humps. For HTC phones, they don't account for the rounded/tapered/ridged backs, which make them look and feel thinner than they really are. That's why I'll still checkout all of the new upcoming phones in person before making my decision.
For example, before I got the D3, I compared it to the Incredible 2 because they were both 4 inch global phones, which is what I wanted. The Inc2 is listed as 12mm thick while the D3 is listed as just 1mm thicker. But when you compare the two phones in person at a Verizon store side-by-side, it isn't even close. The Inc2 looks and feels so much thinner than the D3.
Also remember, the Verizon version of the GNex will be slightly thicker (my guess is around 10mm) than the 8.94mm of the GSM version.
Still, I was worried that at 13.65mm the Rezound might be too thick for me. So for comparison, I went and checked out the T-bolt today, which is almost as thick at 13.2mm. Felt pretty good to me.