Well, finished the main game again, unlocked the bonus stuff, and finished BF. Spent roughly 10 hours over the past 3 days. Not 100% obviously, but whatever.
3D World is such an awesome game. The first few levels are already pretty good but playing the first 'circus' level in World 1 is such an oomph moment. That's where everything comes together - look, sound and gameplay are at their best in those levels. Also, the final boss is still incredibly fun as are the optional levels that follow.
Bowser's Fury is a cool little addition as well, there's some really neat designs to be found in that game and I agree it's probably a blueprint for what the next mainline Mario game will be like. And while some people may claim it's finished too soon, the length was perfectly alright with me. I kinda wished you'd get some flying ability after completing the story as that world would be perfect to fly around in but I guess that would've made it too easy to get the remaining suns.
All in all it's still a great game. Paid €60 for it back in 2015, and €50 for the Switch version and it's worth every penny. Easily a 9/10 game. The game looks stunning, has some of my favorite music in Mario history and controls great. Also, I can play as cat Peach for pretty much the entire game so that alone makes it worth the price of admission.