I don't usually park anywhere near the masses so holding up traffic isn't an issue. People should not be flying through parking lots either.
I understand your point if you got a line of cars behind you. I guess leave for work earlier so you can park at your convenience without being rushed.
About the only time I may not pull through is if the parking spot is on an inclineand it makes more sense to drive in rather than back in. Gravity takes over when leaving (you auto guys probably never think of these things
).