I notice the acceleration, too. Like most people, I didn't notice it at first, but it wasn't until I switched from the Razer Taipan (Avago laser sensor), to the Deathadder 2013 (optical sensor), and then back to the Razer Taipan, that I noticed it.
True, it did take a lot to notice it, but once I noticed it, it was hard not to, and then moved back to the Deathadder 2013 ever since. I'm now searching for a new optical mouse, since the DA is too big.