Being in the IT industry, I get it. Change is needed, and many are initially against the change. I personally liked the old grey, but don't have an issue with the new colors. The font is a smidge small, and could definitely see where anyone with vision issues could have problems viewing the new theme. My suggestion to anyone having issues is to zoom in. CTRL - mouse scroll up for most browsers.
Out of curiosity, I clicked Buckman's link for the dark reader in google chrome. It didn't work. If you're too lazy to google it yourself, I'm pasting the link that worked for me. I do see this as a good alternative as well.