Boe, whose rags-to-riches story (a car mechanic from Fleetwood, outside Blackpool, who was discovered by one of his customers and went on to train classically) would put Cinderella to shame, has sung at the Royal Albert Hall, the Royal Opera House and with the English National Opera at the Coliseum and appeared frequently in the west end.
And yet, despite all these claims to fame, the half-Irish/half-Norwegian tenor is decidedly down-to-earth - and he's made sure to hang on to his Lancashire accent.
Boe is at home in Fleetwood, on a flying visit, filming two documentaries and having just shot a short video for YouTube and ahead of tonight's Proms in the Park.
"It's so nice to be able to see my family," he said.
"It's great being back in Fleetwood but they're the really important thing about being home.
"Whenever I'm back I see my family - and avoid some of them.
"I spend as much time with my mum as I can. I do feel guilty because I don't get home that often, so it's nice to get time here."
On top of his hectic shooting schedule Boe has been preparing for tonight's show on Glasgow Green, and he can't wait to be back in Scotland.
"I'm here until Sunday, or possibly Monday, if I can be," he said.
"Glasgow is a great city; I love it and I've been there many times. I feel at home there."
When Boe first graduated from music college, he says, his first professional role was with Scottish Opera, in a show that toured around the Highlands and Islands and gave Scotland a special place in his heart.
"I remember I was up performing in Glasgow while an eclipse was due to happen," he added.
"Everyone was telling me that it was going to look amazing and the sky would turn really dark. And then it happened and it just looked like the Glasgow sky does all the time.
"But you can joke about that kind of thing in Glasgow as the people have that sort of sense of humour. They are down to earth, honest people.
"They are real life."
Speaking of the Proms, Boe, 39, will be performing alongside former Spice Girl Mel C.
So, the burning question - was Alfie Boe ever a Spice Girls fan?
There is a long, considered pause. "I wasn't," the father-of-two finally admits.
"But please don't tell her."
He pauses again. "I obviously was a big Mel C fan. Obviously. She was always the best singer of the five."
The one-time star of Don Pasquale, Kismet and The Mikado is planning a special treat for fans who make it along to Glasgow Green to see him.
He said: "The Proms are important. They do an amazing job of introducing new types of music to an audience.
"For me, I'm going to be performing quite a different show - not opera music but a mixture of American music, blues, some Burt Bacharach and Elvis Costello.
"There will be some Elvis, so you'll get to see me swivelling my hips.
"I'm very lucky to have that flexibility in my voice.
"I love singing rock music and so I try to have as many different styles in my show as I can - but I don't change my voice.
"I don't adapt my voice; it stays the same and the songs change - I use the once voice I've got."
"But I'm not giving up opera. I get that from my mother - she's always saying, 'You're not giving up opera, are you?'
"And I never would. I just at the moment want to sing other styles and sing the music I grew up listening to."
Speaking of new singing styles, Boe has a fresh album, Trust, out in November.
"The title song on there, it's beautiful. It's about trusting in yourself, your partner and in love.
"One of the films I have been making was quite interesting because it involved going around my home town, going up and down the promenade, to stop people and ask them what the word trust means to them.
"One woman, from London, said you can't trust anyone these days, you can't have any trust in the world. Then a couple, from Bolton, said you've got to trust in people, don't you? You've got to be positive.
"The different responses were very interesting."
But, despite acting as a roving reporter for the day, Boe is slightly coy when the question is turned back on him. "Lager," he says. "I trust in lager." He laughs and then follows his reponse up with, "I can't say family because you have to just take for granted that you can trust the people who you love. You don't even have to say it.
"So, I would say, in seriousness, that I trust in music and that I can put across a song that will make people feel a certain way and that my songs are strong enough to make people trust.
"I also trust in my audience that they will go along with me and take that trust along with them."
But, just when you finally think Alfie Boe has found a way to be serious, he throws in: "Oh, and sweets. "I definitely trust in sweets."