As a photographer I've always brought my dslr, but this past trip I decided to experiment with just bringing my phone because of the new rule about electronics bigger than a cell phone having to be taken out of bags at the TSA check points. I had the iPhone 7 plus at the time and I am SO happy with how well my shots came out, even some night shots. I've had one printed onto an acrylic wall mount at 11x14 and it looks fabulous. Very little (if any) pixelation, colors look great (I do still edit them afterwards, just like I would with my dslr), and all the little details are still there.
I've purchased some lenses from Moment for my phone (a wide angle and telephoto) and don't think I'll be traveling to WDW with my main camera for a while since we've already been so often. I now have the iPhone X which has an even better camera than my 7 did. I don't regret not bringing my camera at all and it let me travel even lighter than I already did before!