I'd like to add my 2cents to this discussion and there's no judgement on anyone for whatever OCI they choose to follow, if it differs from my own.
The 1GR-FE is an incredibly stout and well built engine. It can handle abuse and neglect and still operate fine for years upon years. The new generations of engines being introduced by Toyota, which have been available from other brands for a decade are not as robust and may not be able to handle this type of neglect.
For me, changing the oil costs me $50 (CAD) using Mobil 1 and a Toyota oil filter as I buy my oil when it's on sale. I change my oil every spring after a harsh winter of extended idle times and cold starts and every fall after a summer of off-roading and "abuse". Occasionally I change it 1 additional time per summer if I've done enough long road trips. The extra $50 and 1 hour of my time to change the oil is well worth it to ensure my 4Runners engine has the best chance of remaining healthy that I can give it.
I think of my 4Runner the way I think of people (myself). While I may be able to handle neglect and abuse and still come out the other side, it's not how I want to be treated. I don't treat other people or the things that I own any differently, as not everybody or everything can take that same abuse.
The new generation of Tundras/Tacomas are having some engine recalls already, so creating a habit of maintaining your engines now, while you own one that gives you some leeway to make mistakes, might help you create habits for your next vehicle that may not be able to handle the same treatment.
My wife has a 2015 Ford Edge 2.0 Ecoboost and I change the oil every 6000kms on the some-bich because it absolutely destroys oil. It's currently nearing 200,000kms trouble free (knock on wood) and I've seem many horror stories of failures in ecoboosts from people saying they go 10,000kms between oil changes (sludge, timing failures, lifter/cam damage from lack of oil).
Sorry for the long post... just wanted to share my perspective.