It also depends what you need to learn. Personally, as someone who avoids conflict and always second guesses my decisions, I found poker helps a little to train me out of these traits.
Yeah, there's not a ton I can say I've applied from my years gambling to other parts of my life, but this was the biggest takeaway: Shit happens; Trust the math; Don't let a big win get to your head, either.
If anything, I've learned not to get emotionally attached to day-to-day swings and try to rationally focus on the bigger picture.