No surprise here that I agree with Al - standing in a solo craft sounds good (and on a quiet lake would be good) but on our streams isn't necessary or even efficient. I love being able to skip lures under trees where someone in a boat would have a hell of time trying to do it.
Second - getting up and down constantly through the riffles on some our streams would be silly.
Lastly - most people are barely able to keep a regular, pretty stable tandem canoe upright on our streams, so standing up - yeah, you just go ahead and have your fun with that.