I never use my debit card, but it's certainly not because I'm scared of it! Frankly, it never really occured to me to use it. Checks, credit card, and cash seemed like plenty of options to me. Usually I put everything on my cc (yes, I pay it off every month!) to get ff miles.
No matter which way people are paying, it's just a matter of some people being slow. I always have everything ready. My dh never even takes out his wallet until he sees the total. It drives me insane that he does this, but he won't listen to me. I guess I'm glad that I keep the checkbook, as he'd be a real slowpoke.