I EP. Out of necessity. It is a FAR DISTANT second to BFing. I put in 46 HOURS a week pumping, feeding the baby via a feeder, then washing up. Add a job on top of that, and how do you have time to spend with baby? It's really hard to pump and hold a baby at the same time.
The other issue obvious to me because I have BTDT is establishing supply via EPing is actually more difficult to do in a short period of time. At 4 weeks you would still be pumping every 2-3 hours around the clock, and honestly, you should still be pumping every 2 hours at that point. Dropping sessions earlier can lead to a loss of supply. How would do you that and go back to work? Its much easier to cosleep to nurse at night and then pump during the day at work, even that early.
Keep an open mind about BFing. I was sure I'd never BF, didn't really want to, and I ended up nursing my first for two years.
I'd write more, but I'm one-handed. Bottlefeeding is extremely limiting in that way.