I've been able to do this since I was young. For me, I can trigger it instantly. It's mostly very relaxing. Triggers a yawning response if I do it repeatedly. I think I actually learned it by forcing myself to yawn back then. Feels mind clearing too.
I experience the same, just did it in fact! My ears popped (without yawning) and I didn't realize they needed to equalize but damn if I don't feel more alert now that that's done.
