Why must expression be varied? In the end nobody really is saying much anyway.
Besides, I'd rather deal with someone who's simple in their vocabulary rather than someone who tries hard to seem eloquent. There's less of an ego barrier hindering communication and connection.
I didn't say that I want idiots to start talking like that, I've known a case like this. He was really dumb, and yet he was trying to use fancy words. It was hilarious to listen to him... Later I got bored and told him that I'm bored and that most of what he says is bullshit based on emotions and mass media instead of facts. he got angry and said that kids these days are rude, have no respect for anything and and getting stupid. He also asked what has happened to me.
"I'm sooo going there" is different from "I'm going there." The addition of "so" shows enthusiasm for the destination, and also changes the tone of the phrase to be more musical. The vowel can get drawn out to show the degree of enthusiasm. It can also be used to show sarcasm or other emotions. I don't use that construction very often, but I have used it for humorous effect. When others use it, it doesn't really take up very much of my time to hear it. Would you prefer "I'm definitely going there" or "I'm excited to be going there"?
Whichever one of those two is okay, however "so," this word doesn't fit there. It's like saying "I'm really going there" or "I'm very going there..." Screams shows emotion - ever seen someone screaming like a little girl? Do you like that? I don't. It goes right through my ears. Pretty much because of that though, so it's a little different perhaps.
Where do you stand on lolspeak? "Oh noes!"
I find it stupid and I hate when someone uses it.
For me, language play feels like a quintessential INTP activity. I like puns, long words, obsolete words ("so" isn't obsolete, by the way), juxtaposing formal and informal elements, advocating for plural they, and learning things like what exactly makes a construction passive. I don't mind if someone's clear and polite language has a few extra words.
Sure, I love language play, but I believe that there should be a part about "intelligent" language play. I don't find my examples to be too intelligent, rather dumbing. I guess if I'd lived in the US and watched TV or listened to people talk, I'd start using some of them myself occasionally. On the other hand, I've never used anything similar to this in my language, even though everybody around me speaks like that. However, I'm always trying to seem dumber when talking to my family members, otherwise there's a "smart-ass" title for me to take. And they don't like people different from them. Damn SJs.
That isn't to say I don't get upset about any use of language. I am disgusted by the way the media uses soundbytes to limit debate, and the way scientific-sounding words are used to promote non-science. I don't put up with abusive language. People who say things in such a way as to avoid committing themselves truly irritate me. I also think elementary school teachers and children's television should use standard language in order to provide a good template for kids. I have lots of peeves. I guess we just peeve about different things.
I do have lots of negative opinion about these things as well, though I'm not sure what you mean by abusive language. if you mean words like "a cripple" instead of "physically disabled person," then I instead have a problem with the latter.
"I'm so going there" usually means that you just want to go there, "I'm going there" means you are literally going to be in that location. If you asked the former when they were going to be there, they would have no idea, if you asked the latter they would have a specific time period in mind.
Anyways, to answer your original question- yes, human beings use idioms and slang in language.
I don't mind slangs and idioms either, but I do mind stupidity, which is what I see when I hear someone using 10 extra words in a sentence. Words like "fuck" can be used to emphasize something, but using it too much isn't good, for example.
And actually I see the so as excitement and certainty, while the latter as just a plain expression. For example, I would include "probably" or something like that if I was to say that I'm likely to go there, and if I was certain that I'm going there, I'd just say the plain sentence, the latter example of yours. If I would've wanted to go there, I'd say "I'd like to go there" or "it'd be awesome to go there," etc.. Under no circumstances "I'm so going there."