Products that have bad User Experience (UX) but are still used with Ease

Printer's Buttons

Bathroom Faucets

Television Remote Controls

Toilet Flush Buttons

Door Handles

Some more:

QWERTY Layout Keyboards - discussed here:
http://saurabhkautilyagupta.blogspot.in/2016/12/bad-user-experience-design-keyboards.html

Flight Boarding Passes - discussed here:
http://saurabhkautilyagupta.blogspot.in/2016/12/bad-user-experience-design-boardingpass.html

Switches - discussed here:
http://saurabhkautilyagupta.blogspot.in/2016/12/bad-user-experience-design-switches.html