I couldn't agree more - I tried mint for a while and I basically did nothing with it besides checking my transactions.
YNAB completely changed how I view my money. Now when I go to buy something, I don't just go spend. I see how much I have in that category, and if it's not enough, I either move money to it from another category, or not buy it.
It's been very helpful for me in my goal of saving more than 50% of my take home pay.