Same. My wife isn't much of a gamer but NSMB Wii and NSMBU are some of the only games we'll play together and really enjoy. I think I'd actually pay for subscription DLC for a NSMB-style game if it gave you a few new levels to play through every month or two.
I hoped Mario Maker 2's user-generated content would feel like that, but the levels were so small and puzzle-focused that it really didn't work.
Good. Mario games remind me of playgrounds, and as an adult it's difficult to motivate myself to visit on to slide down the slide, play on the monkey bars or ride the Merry-Go-Round. I'm out of shape and fat, likely to have police called on me by concerned parents/onlookers. Mario games are virtual playgrounds for kids of all ages.