When people write things like "confuzed" or "lolz" or "proceudre", or meaning-changing swaps between "than" and "that" or "than" and "then", or even worse riddled with lower-case "i", I feel compelled to fix it, even if it is minor. The site is supposed to represent questions in English, not in l33t speak or severely broken English. I don't think I'll ever reject a suggestion that fixes spelling. I don't know who it hurts to allow such an edit to pass, and I don't know who it helps to leave misspelled or misleading words.
The only people it hurts, I suppose, are the two people that have to approve the edit. If this is where you're spending most of your time in review, then hopefully you can skip those edits by reading the comment at the top. If it says "fixed spelling" or you can tell on quick glance that it is just spelling/grammar correction, then pass it over. I'll gladly take it off your plate, because I'd rather spend five seconds approving that edit than force tons of other people to spend five seconds stumbling on spelling/grammar issues. It can be extremely distracting to read this junk sometimes.
I realize this is subjective; a minor/needless correction to you might be a major/necessary correction to me, or vice-versa. But IMHO there is no correction too small if it leads to a more correct, clearer post. For the few that are trying to game the system, let them. Are they really going to become trusted users or moderators solely based on fishing the site for misspelled words? I doubt it. I think it's fine to reward them with the rep for some grunt work I only have to approve instead of actually correct myself.