Ah, it's the undead nostalgia thread again. This seems to crop up on a regular basis every week or two ... and it has for literally years.
First, to the OP: The game hasn't changed; you have. There's a thread about it linked from my sig. Read it. The tl;dr version is that you are not a MC newbie anymore, and what you're nostalgic isn't anything in the game; it's you being new to the game and seeing, doing and learning everything for the first time.
Now, to address the "updates have sucked ever since Microsoft bought out Minecraft": there have been no updates TO suck. (a few bug fixes, yes; updates, no) 1.9 is the first post-buyout update. Given that it's not out yet, we can't say for sure whether it sucks or not; however, a lot of people playing the snapshots seem to like it.
Regarding "Notch come back plzplz": Markus Persson was not directly involved with Minecraft development for a matter of years before he sold Mojang. He's not the guy who made Minecraft what it was pre-buyout; that would be Jeb, Dinnerbone, et. al.
"Gliding ruins this, that, and the other thing." Well, if you're playing SP and you accidentally go to the End, kill the Ender Dragon, explore more of the End, find an End Ship, kill its protectors, and -- still accidentally, mind you -- open a chest and find Elytra, there's something simple you can do to avoid that horrible ruination: drag and drop the item out of your inventory and into the Void. Problem solved. In MP, there are a lot crazier things than the ability to glide; virtually all MP servers are modded in some way. There is no doubt a means to remove any given item in the game (I don't run a server myself so I'd have to ask my admin what); so ask your server admin to include Elytra as one of the things to remove. (though if you're playing on a server that already allows flying, warping, or various other ways of getting around, I doubt if you'll have much luck)
If there's some version of Minecraft other than the current one that you like better ... play that version. If you want to play on a server that runs that version ... find one, or get some friends and start your own. But nobody has any right to demand that other people have to play an old version of Minecraft (and which one?) just because you like it better.
But there is absolutely nothing Mojang could do, nothing Notch could do, nothing the Emperor of Mankind could do, that would make Minecraft what you played when you were 10 years old, because you will never be 10 years old again, and you will never play Minecraft for the first time again.
I remember the first science fiction book I ever read. I remember it as a wonderful, glorious book, opening up a whole new world to me. I remember writing my first fanfic (rather badly; I was, I believe, 8 at the time) about it. That book was awesome. Amazing. Something really special. And ... about a year ago ... I had a chance to read it again. Y'know something? It was, um, er, well, pretty lame. Not really bad, per se, but nothing to write home about. Not even anything to read a second time. Not a letter of the story had changed -- but I have. What I remember wasn't really the book itself; it was the way an 8-year-old child felt reading that book for the very first time ever. I'm not 8 years old anymore. I've already read it. What I was so nostalgic for was something which can never happen again, because I can't get younger (I wish!) and I can't unread a book (though there are a few I wish I could!).
It's the same way with Minecraft nostalgia: the OP is nostalgic for what it felt like to play Minecraft for the first time when he was 10 years old. That's why playing an old version doesn't help -- it's not Minecraft itself that he's nostalgic for. It's something that can never happen again, just like I can never read that book for the first time again Past-you is not present-you is not future-you. They say you can never go home again, and they're right -- because even if "home" is exactly the same as it was, you're not the person who left.. Such is life.