The types of checks they do in the PreCheck line are different and take less time, so even a longer line still moves quicker. There’s also far less chance of be

The types of checks they do in the PreCheck line are different and take less time, so even a longer line still moves quicker. There’s also far less chance of being behind a family with strollers, or someone in a wheelchair, which also slows things down. People with PreCheck are usually frequent travelers, and are more likely to be prepared (with everything out of their pockets, etc) when going through instead of having to wait for multiple rescans of the same person.