I still enjoy Morrowind. And I've replayed Ultima IV, although it does get grindy at one point. (For one of my play-throughs as a kid, I got the grindy part and simply boosted everybody to level 8 by editing the save file.)
But, as an adult, I don't really make the time for games anymore. I've been sitting on Baldur's Gate 3 (maybe an hour or two in) for years.
I tried BG3 but found it strongly encourages savescumming and I got overwhelmed keeping track of the saved state tree
I remember using a hex editor (Copy II+ Sector Editor?) to max out both characters and items in the Apple version of Ultima III & IV. The glory days of green and amber
That's my point: as a child/teenager I could dive deep into those worlds, and fill the gaps in graphics/gameplay with my imagination, and just like yours my time was pretty much unlimited. Today I feel alergic towards any kind of game that feels like a job, and requires work and some effort. HoMM from adult perspective is this type of game, it's not a hop-in hop-out type of experience, it's fully opposite.