Back in my twenties I bought a car using a 5 year 0% interest loan from the dealer. I had the cash in the bank to buy it if I'd wanted to, but interest rates were around 7% at the time so using the 0% loan effectively gave me a 15% discount because I got to earn the interest on the value of the car instead of the dealer.

Managed debt is fine. It's only an issue if you over-extend yourself or you have a catastrophic change in circumstances (and you can insure your debt against that...)