> but know enough about our brain to be fairly certain that there is nothing even close to any afterlife
You can't say that for sure. The brain might be a consciousness conduit and not a consciousness generator (which is pretty much what these testimonies are saying). If I step on a garden hose (assuming I can't see beyond it) and the water stops, and I stop stepping on it and the water resumes, you're basically saying the garden hose must be the source of the water, when we know that isn't true (but only because we can see beyond the garden hose). A naïve individual from, say, 10,000 years ago who has never seen seemingly unlimited pressurized water on tap who encounters a garden hose might initially conclude that the hose produces the water...
> it makes humans feel good
There's a large set of things that are broadly agreed to be true which do not make people feel good and a large set of things that are broadly agreed to be true that do. "Feeling good" is therefore orthogonal to veracity so this is a non-argument.
I'm disappointed that you're responding as a person who literally hasn't watched a single one of the videos (because the very things you said prove that). You're just yet another human who prefers to bury their head in the sand than confront evidence against their pre-existing worldviews, like most people. And "with all due respect," that's not rational at all.