In the good old days of slow computers, slow compilers, and tens or hundreds of thousands of lines of code that had to be built before you could test, compiling provided a nice break in your work cycle:
"Why are you just sitting there? Get back to work."
Programmer's automatic reply: "I'm compiling...."
Faster compilers, faster computers, and scripting languages all conspired to remove this perk of the business. Thankfully, automated testing has brought it back:
"Why are you just sitting there?"
New reply: "I'm testing."
Who can argue against testing?