Not necessarily. Most people have no idea that there is a tiny blind spot in their vision. Apparently you've learned in the past that you must look both directions TWICE or you can certainly miss something. Alternatively, instead of just glancing in each direction, look for one full second each direction. I used to have little card with a stick man drawn on it that I used to demonstrate that in driver training.
I guess it depends on your definition of "large" gaps. One of the first things I learned as a young police officer was to stop behind the vehicle in front of me far enough back to see where his rear tires meet the pavement. That practice can (1) give you room enough to pull out and around the car in front of you without having to back up, should that become necessary, and (2) if you should get rear ended by a vehicle behind you, it can keep you from being knocked into the car in front of you. And that has happened to me twice in my lifetime. Getting hit from behind is never good, but if it has to happen, I'd prefer only 2 cars instead of 3 involved and mine damaged only on the back end instead of both front and back.