Credit score only really matters if you need to borrow.
Wait while I try to find my Cliff notes. Darn, I must have misplaced them. Here's the long answer:
Your credit score could keep you from getting hired. If you get turned down for a job or promotion, it could be because of your credit score. It's a good indicator of trustworthiness and risk of theft or embezzlement. It's also an indicator of your ability to meet deadlines. HRs and employers will check credit reports as a matter of due diligence.
When you pull into most car dealerships, they run your license plate and get your credit report. It affects the price you will get on a car since a lot of their profit on the sale is based on a commission or reserve they earn for getting you financing. If you look difficult to get financing for, they'll make up the lost profit in the price of the car. The last thing you want to tell a car dealer is that you're paying cash (even if you intend to).
More and more people are running background checks and credit reports on prospective relationships, so a bad credit score could hurt your chances of getting dates or finding business partners.
Landlords run credit checks on prospective tenants and either charge higher rent to higher risk applicants or deny their applications completely so you might not be able to rent that house or apartment you really like.
Insurance companies run credit reports before quoting you a price. A lower score will cost you more in insurance premiums.
Most utilities (phone, IP service, water, electricity) run credit checks before opening new accounts. You may or may not have to make a deposit to get service depending on your rating.
There's more, but you get the idea. It's a reality of business and life that your credit score can and is being used for other reasons. So it pays to keep track of your credit rating keep it as high as you can and make any corrections that aren't true even if you have no plans to borrow money although all of us do at some point.