My voice is semi-monotonous (more "flat", really). I can't express much, people find it either amusing or are doubtful when I attempt to convey happiness or excitement.
I sometimes stutter, though not that often. I have found that more often I have trouble with putting verbs in the correct tense while I am speaking, and also sometimes getting plural and singular confused. My way of speaking tends to be rather round-about, yet I also tend to use a lot of "large" words where most people would use simpler terms. I also have trouble explaining things from the beginning, when attempting to describe an item or an event, I have the images in my head quite clearly, but the translation of such images gets rather muddled when I attempt to describe them to others.
I don't have as much of a problem conveying abstract ideas, because in general, I think those in words. My personal physical experiences are all imagery, and that is where it gets confusing to relate.
I don't know if it'd be called a "speech disorder," but it is quite embarrassing sometimes. It has happened to me quite a few times at work that I simply couldn't get out what I was attempting to say in a meaningful way, and at that point I usually just give up and say "Ugh, nevermind. I can't talk now."