Manually weaving shots

Hello,

I'm interested in running a hunter in tbc but the idea of a one button rotation pretty much kills the class for me. Is it realistic to manually weave steady shots instead? I've done some research and opinions on the matter are mixed. Some people say manually weaving results in higher dps with practice, some say the macro is essentially perfect and introducing any room for human error will only lower dps. I've seen examples like this: https://www.youtube.com/watch?v=3nGnnUHYn-4 where manually weaving can be used to great effect, but for all I know his dps could've been higher using the macro.

Is the macro just a laziness thing?
If someone put some practice into it could they get equal or better dps by manually weaving?
Does the answer depend on the shot rotation and/or spec?