Yes, have noticed this with my machines. They seem much quieter in the shop, but in the home they sound like the proverbial chaff-cutter, and they have cushioning underneath. I have Brothers (one has a loud whine at times) and now the used Pfaff I bought 6 months ago is worse, so can't use them if someone is sleeping in the bedroom next to my sewing room.
Have been told the later models have some plastic parts which makes them quieter, but haven't had one at home.