Well...I wouldn't give too much thought to it, to be honest. As the Netiquette thread says, it's posting for the sake of posting without contributing anything. But we all do it from time to time, sometimes unknowingly. You already seem to know what it is you want to do, ie post concisely and reach your point quickly, so I'm sure you're able to. I haven't noticed you fluff-posting here anyway.
With regard to your aching brain, don't be intimidated. Some guys here are extremely well read, some are just opinionated. There's no shame in having less knowledge than someone else, and it doesn't mean you can't contribute. I find the more personal posts, rather than the scholarly ones, can tell us more in some cases anyway. You've got a moral compass, and you know if things feel right to you, and why, so just express yourself. If you think what you're going to say might be contentious and you want to avoid confrontation on it, just word it in the right way, or ask for clarification on things if you're not sure.
From what I've seen, you're doing fine. Don't panic!
With regard to your aching brain, don't be intimidated. Some guys here are extremely well read, some are just opinionated. There's no shame in having less knowledge than someone else, and it doesn't mean you can't contribute. I find the more personal posts, rather than the scholarly ones, can tell us more in some cases anyway. You've got a moral compass, and you know if things feel right to you, and why, so just express yourself. If you think what you're going to say might be contentious and you want to avoid confrontation on it, just word it in the right way, or ask for clarification on things if you're not sure.
From what I've seen, you're doing fine. Don't panic!