It's a troubling time for atheists.
The image of a Supreme Judge who is making decisions about how my life will go in the next year is great for 5 year-olds. I do understand the metaphor, and how it suggests that repentance and charity will make your life better, so you might as well be virtuous and considerate.
What I can't deny is the power of the ritual. I have had certain Yom Kippurs over the years that were tremendously affecting, especially during the climactic moments at the end. It's the power of crowd psychology mixed with profound hypoglycemia - a potent combination.
Wishing everyone well - may you get something meaningful out of it.