I this the OP explains it pretty well. Like I have said before 5e is the game I wanted to play when I played back in the 80s, I just didn’t know it.
Exactly my feeling. I played Holmes basic and AD&D and then didn't play for 30+ years. I talk to many, many players who did the same thing I did, jumping from 1e to 5e and loving the game.When I first read the 5e rules I was immediately struck by several things being better.
1) They got rid of "cast it and forget it" magic. I want to be able to cast magic missile twice? I had to memorize it twice. The first time I cast it I forget I knew it, but somehow also remember how to cast it again. In the books I read, using magic makes you tired. Resting lets you cast more magic. 5e gets it right.
2) Leveling up unlocks new abilities. Video games work this way. A lot of people like video games. A lot of people like 5e.
3) Fighters don't suck anymore and aren't boring. Getting 7-8 ASI's/feat creates a lot of interesting fighter variations.
4) The PHB actually tells you the rules for playing the game instead of hiding them away in the DMG.
5) The mechanic of adding a proficiency bonus to d20 rolls for things that your character is good at doing is so simple. Once you get the hang of how proficiency and ability score modifiers work you know about 75% of what you need to play the game. No more tables and charts known only to the DM.
5e has benefited from a perfect storm of factors that have intersected at the right time. First, the rules are good, and appeal to nostalgic, aging Gen-X folks like me as well as younger people who grew up with video games. Add social media that makes it easy to find people to game with. There is a critical mass of gamers of all types that want to meet and play and this has led to the growth of game cafes that provide a convenient public place for ongoing campaigns and AL games. All of this activity has reached mainstream media that now regularly reports on the growth of D&D in a way not seen since the D&D panic of the mid 1980's. Relatively popular books about D&D like Of Dice and Men and Empire of the Imagination: Gary Gygax and the Birth of Dungeons & Dragons were published proximate to the release of the 5e rules. And dammit, it's just fun to sit down with real people and talk and laugh and pretend to be a warlock or whatever.