I think some of it is just being too lazy to move the right foot a few inches over and mash the gas. I drive a manual transmission, and it bugs the heck out of me to watch people in parking lots with automatics back out, then take 4-5 seconds to get into drive and go. I'm usually pushing the stick toward first before the car finishes rolling back, and going within half a second of stopping. The highway equivalent is the ones that pull out onto a 75mph road, get up to about 35 and cruise there for a half mile or more before they suddenly realize they're going 40 under the limit and pick up to 5 over at max acceleration...usually while flipping off the 90 year old woman in a 1983 Tercel that pulled out to pass them when they were going 35.