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Don't get me wrong, router jigs are great but it's overkill in this instance and will still need to be finished off with a sander.
@Soul is starting off with a relatively flat surface backed with an almost completely flat base so there is no need, but if it were a rustic and wide butcher block worktop that had been poorly glued, or a live edge slab for a table, then it would definitely be an option.
Out of curiosity given your near pathological hatred of wooden worksurfaces why are you watching YouTube videos about how to make them?
Bobbo-
Wooden work surfaces in kitchens, specifically around underhung sinks, are my particular bête noire.
That said, self-jigging woodwork jigs for making woodwork equipment is a youtube rabbit hole that I quite enjoy, and I've ended up watching hours of planing, thicknessing, glue ups, routin and sanding
Insomnia has a lot to answer for.
NotThamesWater
Hours and hours of youtube viewing tells me that a router jig is the way to go.
I've watched way too many videos of people making butcher block worktops for woodwork tables, out of big box bought 4x4 pine.