I never used it. Well, I lie, I did use it back in the day for playing some DOS games where you had to share your keyboard with your friend...

But all my keyboards have been TKL over the past 15+ years and I don't miss it. I don't know why anyone needs to use a numpad unless they're in a job where they work a lot with numbers. And if you're not in such a role, what is your hobby exactly that demands so much number punching?