Deleting parameters to save running time?

Following up on what Leith said, if you do something simple like find/ replace or copy/ paste in a few cells, then you (as a human) will not feel any added advantage to learn efficient coding practices. Now on the other hand, if you are going through a million cells and doing the same task then efficiency can save you hours to days of headache. You can even time these processes (through vba) to see exactly how long two different processes really took. I have some codes that runs for days at a time and so every minor tweaks shaves off unneeded time to complete the task.