Starting small, if you don't already know, the animator of Powerpuff Girls and many more cartoons, Loren Faust made a reboot of the cartoon My Little Pony. (Which is nothing like the old MLP) Along with a cartoon team of amazing people who worked on things like, Samurai Jack, Ed Edd and Eddy, and a lot more shows, as well as amazing voice actors (So it doesn't sound awful either) like Q from Star Trek voices a villain, playing Q, from Star Trek.
But Faust, made it as a general, normal, wide audienced, cartoon, rather than a mindless thing for small children, and adolescent girls.
Turns out, it's actually good, really good. Amazing in a lot of peoples opinion in fact. It's funny, it's enjoyable, the plots are fun and simple but not overly. How it's made, and the art style, looks amazing. The characters actually have depth compared to other cartoons. And once you get used to it it's fucking adorable. The characters and cartoon in general also do things that would normally never happen in kids cartoons, like kick a monsters ass's, or fight each other like actual people, verbally and physically. Each character has an episode where they go bat-shit and act the complete opposite of what their character represents. Which is amazing.
So, people like myself, really really enjoy it. But the reason that "There's so many fucking ponies" is that an amazing community of people, who LOVE art, and music, and share a common passion for being good people, have spawned around the show. People with a love for contributing to the community, and interacting with other fans. Creating amazing content like this and more. A lot more, music, PMV's, fan videos, and art.
I personally help moderate a vector group here on DA having to do with, specifically, vectoring screenshots and characters from the show or vector art. I put a lot of work helping, critiquing, and teaching people all over the world with how to properly vector ponies using the three major vector programs.
There is a lot of controversy when people look at fans of this show and say "So you like a little girls show? Wtf?" Which has caused this community that we are a part of to become very close because we all share this passion for this cartoon. And yes. We do love this show. A lot. And we all have our own reasons for why.
The reason: why ponies. Is it's something that brings us together. It's a love we share. It's a love we want to share with others, contribute towards, and be a part of.
If you really want to know what's with ponies. And what's with us. The best thing that I can recommend to you to understand is try watching the show. See what it's about. Some hate the first season, love the second. It's not for everyone, but we're normal people, and we love it. It's great stress relief, something so happy and fun. So why not at least see what it's about.