I've never really understood the way the boundary zig-zags in Kentucky. My counterpart in the Somerset office lives in Russell County, which is in Central time. I don't know how she handles living and working in different time zones. I'm sure she has to get up at an ungodly hour to be at work at 8 a.m. Eastern, unless she's adjusted her working schedule (as we are allowed to do). My counterpart in Elizabethtown lives in Hart County, which is also on CT.
One of the best things that ever happened in Kentucky was Wayne County (Monticello, pronounced Mont-uh-sell-oh) moving from Central to Eastern. I presume that was to accommodate the large number of people who commute to Pulaski County.
For years, my aunt and uncle lived in Grayson County, which is in CT. Most of their business (medical, shopping, etc.) was done in E-town, Shepherdsville, or Louisville. They called ET "Louisville time." Their over-the-air TV (they didn't have cable or satellite for years) was from Bowling Green and Nashville.
I don't adjust well to CT when I travel into that territory, especially since phones automatically adjust and I use my phone as my alarm clock now. If I want to get up at 8 a.m. my time, I have to set my alarm for 7 a.m.
And this time of year is brutal. It's dark at 6 here now, which means it would be dark at 5 if I was in CT. Forgive me if I can't get excited over the possibility of that happening.
Seems to me there was a time when most of eastern Kentucky was temporarily moved into Central time when I was a kid, possibly during one of the Nixon-Carter energy crises. Can't remember why, or what the intended goal of that was. I thought that having it get dark at a later hour on the clock saved energy and getting dark earlier used more energy.