Anyone who hasn't been up working all night to fix a car they have to drive to work the next day may not have shared these golden moments that we have.I replaced three fuel pumps in the same car one summer. Another time I wiped out three main bearings, and had to fix it over a weekend so I could get to work. That's all on a classic muscle car. The parts were cheap though. But, the pain in the ass factor was fairly high.
My personal opinion is: worrying about it will not make a part fail prematurely, and the lack of a current problem is usually considered a good thing.