I miss the 90's way more.
Same here.
While I do recall some things about the 2000s fondly, for me the 2000s was the beginning of a general decline in, well, everything. And the more time passes the more things just get worse. For all the 1990s problems it was kind of a golden age.
The thing I miss the most is that it feels like a lot happened, especially on a personal level. I saw the transition of video games from the NES to the beginnings of the 3D revolution including some of the granddaddies of things like Elder Scrolls which would later become huge, while other things disappeared off the face of the earth. The 1990s was when I saw animation go from fun to edgy to dumb and when I witnessed the first major push of anime into the west (back when anime was still good).
Friends came and went, old haunts changed locations or closed entirely, and new ones opened up for the first time. The internet was still in its infancy and was more a cool toy than the society-controlling megalith it is today, and personalized fansites still existed that could host anything.
The 2000s was when things started to change for the worse. A lot of the bad movie, animation and anime trends I hate today were first starting in the 2000s, and a lot of modern video games play a lot like games I hated in the 2000s. The only saving grace was the internet was still in a sort of wild west.
Of course, that's gone now. The likes of Spoony or Retsupurae could never rise in this current atmosphere, and now the internet is just "the Youtube machine" as far as I'm concerned.
The thing I miss most is rental stores. The primary way I discovered new things back in the day was going to Hastings (my area didn't have a Blockbuster) and just browsing the shelves. These days that's impossible. How am I supposed to discover a new game or anime now? Going to torrent sites just gets me a list of "Indecipherable Japanese Title 1-26 Eng Sub" and if you click, you rarely get a description of what the show is about, if there's any info at all. Video game digital stores are often just word vomits of buzzwords and industry terms that mean nothing to the end player.
So even if anything good is made now... its hard as hell to discover.
What's left? Recommendations? Nine times out of ten people just recommend stuff either you've already seen or which is stupid popular. No, I'm not interested in seeing Jojo, quit namedropping Jojo. And yet that's the situation: you're likely to only hear of something if its already well known.
I sometimes think this is why the industries are all in Remake Hell... because they have the same problem: nobody cares about Original Ghost Story but call it a new Silent Hill and suddenly they know what it is. It's like that thing Bane said once: "I put on a mask so people know who I am."