It actually can for a second... might not seem much but enough to catch you off guard especially if your hands are full and conditions aren't smooth.
I only know because I've experienced it first hand on a steep descent (wasn't even an emergency descent) I was down the back, flight had been a little rough due to the hot weather and when the descent began all four of us who were in that spot lifted off the floor for a fraction of a second.
You guys up the front don't feel it the same as people standing up down the back.