The couple had been married for 40 years and were best friends from the moment they met.
He died on the water that he loved, sailing in a boat that he adored, in good health after having dodged three near-death experiences in his life - but that was another long story, she said.
Rosie described her late husband as "a thinker and a loner, totally enjoying his own company a lot of the time".
They had three children together - Chris and twin girls Rachel and Becky.
"He [Chris] won Keith's heart very early on and Keith became an exceptionally loving father over time.
"He adored his daughters and they adored him."
At Lane's funeral, his daughters said: "He [Lane] wasn't just the best Dad in the world, he was one of our best friends."
Lane's son Chris added: "Dad was one of the most supportive, selfless and generous people I've ever met, and he would constantly inconvenience himself to put others first without expecting so much as a thank you.
"I'm glad he got to live a full and happy life bursting with passion, laughter and the things he loved.
"He will be dearly missed by all."
Lane's business, The Gearbox Factory in East Tamaki, had announced his death.
"It is with great regret that I have to inform you that Keith Lane, manager and owner of The Gearbox Factory, has been killed in a tragic boating accident on Saturday 15/2/2020."
Lane had single-handedly participated in the Bucklands Beach Yacht Club on his Farr 1220 boat and was anchored at the bottom end of Waiheke Island, just around from Man O War Bay.
He owned the business, which provided transmission and gearbox service and repairs from 1989 onwards and had 30 years of practical experience in the industry, the website said.