I feel forced to talk because it is expected of me, but it is exhausting. After a day of having to be "on call" verbally--having to be ready to talk at any moment--I am always tired. I'm fluent in speech... usually... but sometimes it's not communicative. It's just formulaic stuff, mostly scripted. I don't think people around me realize just how much I script things.
It's like language in a can, open it up and throw it at the nearest person. If I get tired, my speech can be entirely meaningless, but most people don't really notice because it's grammatically perfect and somewhat fits into the situation. Most often, it'll just be irrelevant stuff that fits in okay, but doesn't express what I'm thinking or feeling, or rambles on about a favorite topic. Sometimes it's wrong--more like confabulation than lying, stuff I say because I had to say whatever fit into the conversation and I didn't have time to think of how to say what I actually meant to say.
I think a lot of the lectures I end up giving nowadays are because I was tired and that's just what came out. They're rather different from the enthusiastic aspie-lecture style, in that they're mostly just repeating old information which I learned long ago, and may even have already told the person I'm talking to. They're a product of the pressure to talk forcing me to talk, but without the energy and ability to carry on a proper conversation, stuff just comes out for no particular reason.
I do like the shift to text messages over phone calls over the last few years. It's wonderful to be able to just write out what you want to say without having to worry about conversations. Sign langauge isn't very appealing to me because of how much movement it involves and how much I'd have to constantly start and stop movements, but I would love to have permission to communicate in text more often. E-mail, text messages, online forums...
Do you guys feel that constant pressure to talk, too? It really gets on my nerves.