Weird to see folks throwing a builder out as part of a standard opener, unless it's for an early chop. You don't have the pops, you don't have techs unlocked yet, you can't remove jungles, your borders haven't expanded yet. A lot of reasons to focus on getting a settler out over a builder.
It's simply insane not to build a scout. Builder over scout? Exponentially insane, given that a free builder is a fairly common goody hut reward (gold is another, buy one). Always scout if the map offers enough land. Plus, city-states. Plus, natural wonders. Plus, opening the map up before choosing a pantheon. Plus, boosts to Astronomy, Political Philosophy, Writing, and Foreign Trade.
If I've got to settle flood plains, I chase Great Bath these days. Probably shouldn't. Waste of time, really, but I've gotten it enough times to feel encouraged.
Slingers are nice and cheap. Get a warrior and slinger out there to go wipe out barb camps. Get that gold, GA points, and boosts to Military Tradition, Bronze Working, and Archery.
Builders are usually the first thing I buy with gold.
I don't play no bully-boy early-rush crap.