Willett, who won the Omega European Masters at Crans-sur-Sierre in 2015, has played in every edition of the tournament since his debut in 2009 and is one of five former champions in the field this week.
"It is always nice to come back to a venue where you have good memories," the 34-year-old from Sheffield said.
"The family always come, it is always a fantastic week up in the mountains. I was fortunate to win in 2015 and get my plaque on the street. It's a real iconic venue and you'll see that by the guys who come back year after year.
"The game is pretty close. I have played quite nice, just not had the results. I finished 12th at Augusta, seventh a couple of weeks ago (in Minnesota), top 20 at the British Masters. A few good ones scattered in there."
Denmark's Rasmus Hojgaard will defend the title he won last year as he bids to join major champions Seve Ballesteros and Matt Fitzpatrick in claiming back-to-back titles in the Swiss Alps.
And the 21-year-old would also love to emulate fellow Dane Thomas Bjorn in lifting the trophy for a second time.
"It would be very cool," Hojgaard said. "I just have to go out, focus on myself, and play some good golf and see where it ends up at the end of the week.
"I was practicing with Thomas last week in Himmerland, and he said 'You know Rasmus, one of us has won twice in Crans'. I really want to get that second win here so that I can jab him a little bit."