I have taken my DLSR on every cruise over the past 14 years and it has been to every port off the ship with very few exceptions. The one being Almeria, where there wasn't anything there, so instead of lugging it around I decided to use my iPhone, in Split my wife and I were on a Kayaking adventure, therefore we used a Go pro, and more recently when we went helmet diving in the Caribbean, we used my Olympus TG5 to get some great under water shots.
I have, many times, considered leaving my Canon behind. It's an old 400D which only takes 10 mega pixel photographs. Most of the modern day camera phones will easily out megapixel my camera, however, with a 24mm pancake lens, which can shoot sharp images at f2.8, and go up to 3200 ISO (with a push) then I will try to take it with me.
I am currently looking at changing the camera, just because I have a 4-month-old who is quite active and would like something with a higher FPS. I wish I could just use an iPhone for everything, but it's just not the same. Until larger sensors are used in phones, I am going to try and persevere with the DSLR. My main thing that I am looking at is cutting down my camera entourage and using one camera and a lens. I tried this years ago with my 400d and used an 18-200 but found that image quality suffered, therefore I bought a 24mm prime which stays on the camera most of the time. Through work I have used of a Sony A6400 which is great for bursts, but there's something that I quite like about my Canon. Maybe it's part of the family?