Am always somewhat bemused when a comment is made "Isn't it a bit bumpy today" when one is encountering what I would describe as light turbulence. I usually say something like "You should feel it when it gets really rough!"
Unfortunately we cannot see the air - if were in a boat on the ocean we would see most of the waves coming and be perhaps better prepared for "turbulence".
Also over the years I have noticed that some pilots are naturally better at flying in turbulence compared to others and indeed a few appear to be quite uncomfortable with flying in such conditions. Personally I quite enjoy it but on the other hand will take steps to avoid wherever possible so that the folks down the back don't spill their gin and tonics!