Efficiency is quite simply making something easier to do. Efficiency comes in many forms however.

Reducing the strength required makes a process more physically efficient.

Reducing the number of steps in a task makes it quicker (i.e. efficient) to complete.

Reducing the number of parts makes repairs more efficient.

Efficiency can be found almost everywhere. If something is easier to do you are more likely to do it. If you do it more, then it is more useful. Again, utility is the only true measure of the quality of a design.

Reducing the amount of training needed, i.e. making it more intuitive, gives you a larger number of people who are qualified to perform the task.

If you willingly do something more often you have a greater chance of liking it. If you like doing it you will be more comfortable doing it.

So the next time you hear the term ergonomics you will know what it means to you. And I hope that is a comforting thought.