Defending champion Spieth held a five-shot lead with nine holes to play at Augusta National, but saw his hopes of back-to-back titles effectively disappear when he ran up a quadruple-bogey on the 12th.
Willett was perfectly placed to capitalise thanks to a flawless closing round of 67 which made him the first English winner for 20 years and the first European champion since 1999.
And after rising to a career-high ninth in the world rankings, the 28-year-old has no intention on resting on his laurels, despite having also become a father for the first time just 12 days before his Masters triumph -how wife Nicole giving birth to Zachariah James.
“I’m a long way behind points wise but it’s always been a goal of mine to be number one in the world,” Willett told Press Association Sport.
“It’s the reason you get up in the morning and go training, to go and hit balls and putt. It’s what you do and how you go about your daily business to try and achieve something great.
“Fortunately I’ve now tasted the top echelons of the sport and you just want more. You want to keep dedicating yourself to working hard and playing good golf and hope to be more and more in them positions on a Sunday afternoon at majors, World Golf Championships and normal PGA and European Tour events. That’s what we work for.
“We’re going to try and enjoy a bit of normal time off and then get straight back to the job in hand of trying to achieve those goals.
“There’s no targets been set in terms of that (number of majors). I think the only target you can set yourself is how hard you work and if you can tick that box and you’re working hard at the right things, if you win a couple of golf tournaments along the way that’s fantastic.
“And if that can take you to some of them dreams I guess, not goals, then that would be fantastic. A dream of mine was to win major championships and that’s what I dedicated myself to do, to work hard and gain that self belief it one day might happen and weirdly, three days ago, that’s exactly what did happen.
“I don’t like to set myself goals in terms of winning X amounts of tournaments, it’s more just ticking boxes of doing the right things every day.”
Asked if he would get the credit he deserved in the light of Spieth’s collapse, Willett added: “I don’t really mind what people think, who won or who lost. I am obviously able to sit here in the green jacket and enjoy it.
“Part of golf is being able to handle certain things, handle the pressure and hit the right shots at the right time. If I’d have shot 72 and Jordan did what he did it would have been a different story.
“I was able to put myself in a position where if anyone did make a mistake we were there to capitalise and that’s we did. It’s what (Nick) Faldo did in ’96 with (Greg) Norman, it’s what happened many a time in golf tournaments around the world. That’s golf, that’s life.
“I do feel very fortunate that I was in the position to be able to capitalise on a few of the things that happened to Jordan. He had a bad beat on 12. He might not have hit the best golf shot in the world but the punishment around there is massive. But I still had to be in the position to go ahead and do what I did.
“Who won, who lost, I don’t really know what people are going to think and I’m not really that fussed to be fair.”
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